diff --git a/Cargo.lock b/Cargo.lock
index 6867ecb..72b964a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -23,3 +23,7 @@ version = "0.1.0"
 [[package]]
 name = "day_6"
 version = "0.1.0"
+
+[[package]]
+name = "day_8"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index b433b71..1a0444f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,4 +6,5 @@ members = [
     "day_4",
     "day_5",
     "day_6",
+    "day_8",
 ]
diff --git a/day_8/Cargo.toml b/day_8/Cargo.toml
new file mode 100644
index 0000000..9b2f0b9
--- /dev/null
+++ b/day_8/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "day_8"
+version = "0.1.0"
+authors = ["Smaug123 <patrick+github@patrickstevens.co.uk>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day_8/input.txt b/day_8/input.txt
new file mode 100644
index 0000000..f873597
--- /dev/null
+++ b/day_8/input.txt
@@ -0,0 +1,1000 @@
+o inc 394 if tcy >= -3
+s inc -204 if s <= -5
+keq inc -34 if keq > -6
+ip inc 762 if ip == 4
+zr inc -644 if ip >= 6
+myk dec 894 if yq == -10
+pc dec -990 if keq > -44
+hwk inc 106 if qfz == -5
+o inc 406 if qfz != -3
+ljs dec 34 if myk == 0
+n inc 579 if n != -6
+sd dec -645 if pc <= 992
+ow inc 154 if bio == 0
+ige dec 108 if ip >= -9
+py dec 799 if vt == 0
+qfz dec -943 if tcy <= -9
+hwk inc 569 if o == 800
+tcy inc 90 if gij < 3
+qpa inc -15 if ip < 1
+keq inc -2 if u == 0
+qpa inc -132 if keq <= -38
+hwk inc -87 if zr == 7
+ige dec 759 if g >= 9
+cy inc -232 if scy > -8
+hwk dec 539 if vt >= -7
+d inc 517 if d <= 8
+keq inc -65 if d < 509
+sd dec -585 if vt >= -1
+zr dec 970 if vt < 6
+yq dec -670 if n == 579
+qpa inc -839 if sd != 1226
+s dec -633 if hwk > 26
+sd inc -310 if g > 6
+ljs inc 764 if o != 790
+yq dec -785 if tcy >= 83
+qfz inc 136 if ljs == 721
+myk inc -699 if n == 579
+qpa dec -16 if ow > 146
+ow dec -257 if ige >= -112
+d inc 675 if d != 517
+gij dec 294 if bio >= 1
+bio dec -937 if vt < 9
+myk dec -630 if ige < -105
+qpa inc -630 if bio > 930
+ip dec -280 if ljs >= 738
+hwk inc 532 if myk <= -61
+sd inc -71 if pc >= 987
+zr inc -753 if ip == -10
+bio inc 716 if scy >= -3
+u dec -59 if ljs >= 721
+tcy dec -872 if py <= -803
+si dec -480 if py != -799
+cy dec -99 if gij <= 7
+bio inc 804 if d <= 508
+cy inc 489 if si > 0
+o inc -910 if si <= 9
+pc dec 393 if s <= 633
+zr inc -580 if zr != -967
+ige inc -824 if qfz >= -7
+d dec -138 if o >= -116
+ige inc -16 if scy < 2
+s dec -29 if ip != 6
+py inc -172 if bio <= 1657
+keq inc 648 if tcy != 89
+cy dec 324 if n > 575
+ljs inc 624 if myk <= -61
+n inc -643 if qpa == -1468
+py dec -637 if g != -2
+zr dec -174 if myk == -74
+hwk dec 746 if scy >= -4
+myk dec 775 if pc < 602
+ljs inc -490 if s < 670
+vt dec 173 if yq >= 1453
+bio inc -106 if bio <= 1661
+ljs inc 654 if qfz <= 6
+gij dec -932 if d == 655
+ige inc 146 if ljs == 1518
+py dec 294 if myk > -850
+zr inc 370 if n > -68
+pc inc 463 if ige != -802
+sd inc -300 if d != 645
+ip dec -523 if hwk < -178
+sd inc -652 if vt > -164
+yq dec -493 if d < 663
+ljs inc -612 if o < -110
+myk inc -211 if bio <= 1544
+gij dec -630 if pc < 598
+ige inc -45 if ow <= 403
+keq dec -658 if cy == -457
+py dec -171 if gij <= 1565
+hwk inc -159 if ljs < 1521
+sd inc 475 if qfz >= 4
+myk inc 516 if ow >= 411
+hwk dec -812 if u < 53
+d inc 544 if ige >= -805
+cy inc -594 if ow >= 414
+zr inc -98 if tcy < 85
+cy dec -242 if sd == 859
+bio dec 177 if ljs == 1518
+myk inc -485 if ow < 420
+s dec 451 if myk < -810
+qfz dec 865 if yq > 1954
+zr dec -430 if cy != -211
+yq dec -640 if py < -451
+qfz inc -886 if ljs == 1518
+gij inc -636 if keq > 1267
+bio inc 932 if ow >= 411
+qpa inc -638 if sd != 859
+qfz dec -726 if n != -61
+tcy dec 303 if yq <= 2579
+vt inc -915 if keq <= 1275
+n inc -653 if zr > -747
+ow inc -583 if keq <= 1277
+scy inc 522 if pc > 596
+gij inc -186 if n <= -56
+sd dec 908 if qpa < -1472
+o dec -157 if si < 3
+g inc -239 if si < -9
+ige inc -454 if hwk < -333
+qfz inc 992 if qpa >= -1470
+py dec -876 if sd > 852
+py inc 983 if scy >= 513
+vt inc -633 if yq <= 2592
+o dec -167 if pc < 599
+yq inc -784 if ip < 529
+bio dec -179 if cy <= -209
+keq dec -213 if keq <= 1278
+s inc 845 if u >= 56
+vt dec -890 if n <= -60
+ow dec 479 if myk > -815
+gij dec 93 if pc > 591
+qfz dec 976 if pc == 597
+myk dec -402 if pc > 588
+cy dec -248 if s != 1054
+n dec -519 if ljs == 1518
+ow inc 323 if o < 224
+ow dec 386 if ljs > 1509
+scy inc 175 if ow != -715
+tcy inc -344 if ip > 525
+o inc 200 if si <= 4
+ip dec 942 if bio > 2477
+keq dec 983 if sd < 864
+o inc 776 if o < 420
+vt inc 284 if ljs > 1510
+qfz inc 272 if myk > -407
+tcy dec 276 if myk != -411
+si inc -634 if keq == 500
+gij inc -767 if g == 0
+o inc 857 if o > 1189
+yq inc -490 if cy != 27
+vt inc -646 if qfz != -153
+n dec 388 if n >= 447
+yq dec -734 if pc > 603
+ljs inc 382 if vt <= -1187
+si dec 933 if bio > 2477
+qpa dec -572 if ip == -419
+scy inc -520 if keq == 500
+g inc 133 if ljs <= 1908
+ow dec -77 if ige >= -1264
+si dec 984 if yq >= 1305
+n dec 53 if pc == 597
+zr inc -682 if tcy >= 89
+g inc -839 if n > 16
+keq inc 975 if qfz <= -145
+hwk inc -592 if u >= 51
+s inc -786 if gij != -113
+keq dec -805 if n < 16
+ige dec 854 if hwk < -940
+yq inc 656 if ow <= -643
+qfz inc -577 if pc <= 590
+d dec -85 if d < 1208
+keq inc 546 if cy == 33
+bio dec 23 if ip == -419
+si inc 205 if cy < 37
+ige dec 979 if sd >= 855
+o dec -482 if vt > -1198
+cy dec -72 if gij <= -112
+yq inc 276 if hwk > -930
+zr inc 994 if qfz > -153
+hwk inc 843 if py >= 1412
+ige inc 468 if hwk >= -940
+sd inc 477 if myk < -406
+vt inc 557 if gij >= -124
+tcy inc 949 if ljs == 1900
+qpa dec 321 if g < 136
+scy inc 502 if pc < 603
+ljs inc -339 if cy <= 95
+gij dec -963 if ljs < 1902
+myk inc 1000 if bio >= 2449
+sd dec 317 if gij != 849
+qfz dec 148 if sd > 1027
+g dec -786 if s <= 279
+py dec -451 if ip != -422
+ljs inc -756 if gij != 837
+d inc 459 if ljs > 1140
+hwk inc -371 if u > 58
+u inc 765 if qfz < -141
+ljs inc -69 if yq != 1324
+ip inc -347 if o <= 2530
+gij inc -56 if cy < 108
+zr inc 988 if qpa <= -1216
+o dec -671 if zr < 552
+n inc -680 if qfz < -136
+ow dec -709 if sd < 1027
+ip inc -73 if si <= -2352
+hwk dec 673 if gij <= 796
+s inc 806 if py != 1856
+zr dec -792 if g >= 910
+si dec 325 if gij > 787
+u dec -950 if ow == 73
+yq dec 821 if sd <= 1025
+g dec -160 if myk == 589
+ljs inc -870 if gij >= 795
+ow inc -309 if o == 3200
+s dec -472 if s == 1076
+ip dec 510 if keq < 1852
+sd dec -599 if vt != -629
+ige dec -147 if g > 1076
+sd dec 602 if hwk == -1979
+keq dec 215 if ip <= -1286
+cy dec -290 if tcy >= 1038
+pc inc 816 if g == 1079
+cy inc 171 if bio != 2467
+ip inc 104 if d >= 1734
+scy inc -577 if qfz > -146
+n inc 209 if cy != 558
+qfz dec 130 if yq < 501
+ow dec 740 if ip <= -1165
+d dec -857 if vt > -639
+pc inc -981 if bio < 2460
+zr dec -979 if ow == -972
+n inc -167 if ljs == 1071
+ljs inc -315 if vt >= -636
+vt dec -276 if gij > 779
+g dec 778 if ip >= -1178
+sd inc -976 if tcy >= 1040
+d inc -517 if n > -467
+ljs dec 359 if ow <= -976
+gij inc -811 if u >= 820
+ljs dec -768 if scy != 102
+u dec -584 if zr < 1333
+qfz dec 588 if qfz > -268
+zr inc -775 if ow < -972
+myk dec -693 if vt >= -367
+cy inc 937 if s > 1549
+hwk dec -686 if u >= 821
+tcy dec -868 if qfz != -276
+qpa inc 97 if scy > 111
+gij inc 296 if pc != 432
+cy dec -559 if o != 3199
+g dec 59 if ip < -1166
+keq inc -262 if zr != 563
+o dec 823 if py >= 1844
+ljs dec -253 if g < 243
+ow inc -351 if tcy != 1914
+myk dec -684 if d <= 2092
+zr dec -175 if qpa == -1221
+s inc -96 if scy <= 92
+o inc 492 if keq <= 1589
+tcy inc 563 if n > -464
+ljs inc 764 if s < 1553
+qpa inc -475 if qfz > -278
+hwk dec -474 if myk >= 1957
+o dec -709 if vt >= -364
+ip dec -372 if bio == 2458
+ip dec 361 if qfz != -272
+tcy inc 986 if sd < 1019
+ow dec 405 if hwk >= -809
+n inc 894 if ow != -1336
+g dec 648 if cy != 1116
+si inc -49 if gij == -24
+ip dec -787 if myk <= 1974
+ljs dec 449 if scy <= 111
+ow dec 940 if qpa != -1698
+pc dec 788 if qfz > -277
+u inc -955 if bio <= 2465
+sd dec 113 if pc < -352
+n dec 827 if ow <= -2260
+tcy inc 298 if myk < 1973
+g inc -615 if ige > -1630
+ige inc 561 if o != 3578
+scy dec -853 if myk > 1962
+ige dec -248 if scy == 955
+ip dec -961 if ige <= -1372
+gij dec 441 if bio >= 2456
+cy inc -631 if o == 3578
+o dec -801 if gij == -465
+zr dec -313 if scy <= 946
+s dec -959 if yq == 493
+s inc 77 if g > -1023
+sd inc -160 if yq >= 485
+yq dec -274 if pc != -357
+d dec -882 if ige >= -1379
+vt dec 311 if o != 4383
+ip inc 732 if n < -384
+ljs inc 742 if py < 1854
+yq dec 707 if s < 2588
+si inc -970 if cy != 486
+cy inc 867 if scy >= 961
+ow inc -880 if myk != 1972
+pc inc -36 if ige <= -1369
+g dec 308 if qpa > -1698
+ljs dec -900 if gij >= -474
+qpa inc 87 if hwk != -817
+zr inc -763 if py == 1853
+g dec 990 if myk <= 1975
+tcy dec -579 if vt < -672
+keq dec -565 if pc >= -399
+u inc 381 if pc < -384
+o dec -195 if bio > 2456
+myk dec -39 if yq != 60
+qpa dec 416 if bio == 2458
+u inc 351 if keq < 2150
+s inc 854 if vt >= -668
+d dec 502 if myk < 1976
+scy inc 372 if qpa >= -2023
+hwk inc 362 if g == -2319
+keq dec -972 if n != -390
+pc inc 415 if tcy <= 3759
+n inc 37 if sd > 737
+n inc -617 if py != 1860
+yq dec -446 if yq <= 62
+ow inc -865 if pc == 23
+n inc -157 if ljs == 2619
+qfz inc 885 if keq != 2147
+ige dec 106 if d <= 2460
+sd dec 409 if d < 2469
+ige dec 219 if d >= 2454
+g dec -861 if qpa > -2029
+cy dec 216 if ljs == 2611
+ljs dec -993 if qpa < -2027
+qfz inc 777 if d < 2467
+ljs inc 348 if d != 2470
+o dec -187 if bio > 2455
+gij inc -778 if d == 2463
+ige inc 798 if ip != 1321
+n dec 160 if tcy < 3762
+ip dec 431 if o > 4758
+keq inc 889 if ip <= 890
+si inc -272 if zr <= -192
+zr inc -289 if sd != 344
+si inc 843 if o == 4761
+ige inc -940 if ip >= 887
+pc inc -189 if keq < 3045
+o inc -658 if yq >= 501
+n dec -886 if keq >= 3045
+tcy inc -3 if o > 4095
+ow dec -639 if n < -1125
+n dec 81 if ip < 891
+qpa dec -430 if qfz <= 1394
+cy inc 602 if bio >= 2457
+qpa inc -579 if hwk >= -448
+qfz inc 559 if g > -1460
+u inc -902 if yq <= 507
+py dec 556 if s > 2578
+ige dec 439 if bio != 2467
+hwk inc 327 if scy <= 1330
+d dec -634 if o > 4103
+myk dec 919 if qfz < 1957
+tcy inc 680 if keq < 3050
+qpa dec 628 if cy == 880
+zr dec 112 if u <= -650
+o dec -214 if si <= -2788
+keq inc 132 if bio > 2451
+myk inc 229 if qpa != -2219
+keq inc 651 if n != -1203
+si inc -655 if qfz != 1942
+py inc -726 if zr < -595
+scy inc -565 if py >= 567
+qfz dec -219 if vt >= -661
+py dec -405 if u > -656
+ip dec 668 if g != -1454
+sd inc -496 if py == 976
+zr dec 315 if s != 2590
+o dec -355 if myk >= 1047
+cy dec -575 if keq <= 3831
+o dec 589 if qfz != 1947
+sd dec 487 if scy != 768
+qfz inc -742 if n == -1211
+n inc -81 if n > -1220
+pc dec -747 if bio >= 2454
+pc inc 814 if qpa == -2219
+myk inc -874 if sd < -642
+myk inc 375 if bio <= 2450
+u inc -7 if ip <= 229
+scy dec 677 if cy >= 1455
+keq dec 746 if zr != -917
+yq inc 594 if hwk >= -121
+qpa inc -511 if bio != 2456
+tcy dec 24 if zr < -919
+o inc 10 if vt >= -679
+ow dec -995 if yq != 506
+py dec -144 if tcy >= 4425
+g dec 501 if si > -3457
+sd inc 911 if scy > 82
+gij inc 545 if keq == 3080
+gij inc 498 if vt <= -671
+yq inc 728 if ip >= 227
+si inc -751 if u > -669
+keq dec 819 if d > 2453
+ow inc -863 if pc == 1395
+bio inc 651 if hwk < -134
+s inc -818 if gij != -200
+scy dec -26 if vt >= -675
+ow dec -279 if d > 2454
+n dec -451 if pc <= 1403
+myk dec -113 if ljs != 2967
+myk inc 14 if ip <= 210
+bio inc 473 if hwk < -126
+sd dec -907 if pc > 1392
+qfz dec 21 if sd <= 1170
+s inc 612 if vt != -664
+qpa inc -734 if o != 4686
+zr dec -487 if cy > 1453
+myk dec -733 if sd > 1176
+tcy inc -873 if ip >= 220
+tcy inc -28 if vt <= -670
+scy dec -793 if qpa <= -3465
+u inc 301 if qfz >= 1180
+d inc 515 if g > -1950
+scy dec -335 if g > -1965
+hwk inc 563 if scy == 446
+bio dec -980 if py > 1112
+yq dec 504 if o <= 4683
+keq dec 458 if scy > 443
+o inc -840 if sd > 1159
+pc inc 922 if g <= -1957
+si dec -305 if ljs < 2960
+si inc 576 if ip > 212
+pc inc 167 if n == -841
+u dec 354 if d < 2470
+py dec -167 if qpa > -3469
+bio inc -599 if bio < 3912
+u dec -783 if s >= 3190
+hwk inc -838 if gij != -210
+ow dec 803 if keq >= 1803
+ow inc -592 if qpa > -3463
+gij dec 475 if d == 2463
+g dec -344 if u <= 69
+si inc -575 if yq != -7
+ige inc 247 if py != 1296
+scy inc -847 if g >= -1966
+zr inc 405 if yq > -5
+si dec -102 if zr > -25
+ow dec -630 if ip <= 221
+o inc 563 if si <= -3788
+qfz inc 722 if myk != 285
+gij inc 461 if ow > -4139
+bio inc -605 if cy < 1461
+ige inc -235 if scy > -404
+zr dec -637 if n != -840
+n dec 847 if gij < -211
+keq dec -165 if keq != 1806
+o inc -27 if ige >= -2166
+d dec -751 if n <= -1681
+o dec -847 if scy < -395
+hwk inc 526 if n < -1681
+ow dec -197 if o > 5234
+o dec 730 if py != 1285
+ljs inc 300 if o < 4503
+vt dec -530 if u > 66
+n dec 862 if zr >= 615
+si inc 804 if py <= 1289
+myk dec -87 if n == -2550
+pc inc -633 if vt >= -141
+scy inc -392 if myk == 373
+scy dec 444 if scy != -793
+tcy inc 806 if zr < 624
+vt inc 957 if ip <= 212
+zr inc -380 if keq == 1968
+n inc 519 if ow <= -4124
+bio inc 738 if d != 3219
+hwk inc -599 if yq == 2
+ip dec -795 if ige < -2155
+s inc -205 if myk == 373
+zr dec 36 if keq <= 1970
+pc dec -69 if ige == -2160
+hwk dec 239 if tcy != 4333
+ige dec 197 if s <= 3000
+u dec 564 if tcy != 4326
+u dec -109 if zr != 197
+py inc 61 if vt >= -147
+s dec -736 if tcy != 4330
+u inc 385 if n != -2030
+keq dec 98 if s > 3726
+bio dec 467 if d == 3214
+si dec 616 if ljs <= 3259
+scy inc -799 if o == 4495
+myk inc -364 if u < 8
+qfz inc -180 if s != 3718
+py dec 954 if gij == -214
+qfz inc -608 if o >= 4487
+ige dec -214 if ow < -4130
+py dec 31 if qpa > -3471
+d dec -625 if d <= 3210
+ljs dec -407 if cy < 1460
+n dec -218 if py >= 355
+vt dec 577 if py == 363
+hwk dec 406 if cy != 1464
+g inc -243 if bio != 2968
+keq inc -322 if vt > -727
+tcy inc -159 if bio < 2970
+qfz dec 208 if ljs > 3661
+u inc 130 if u != -2
+si dec 283 if g == -2202
+hwk inc -489 if n <= -1812
+u inc -895 if gij < -219
+vt dec -375 if ljs < 3668
+pc dec 325 if o == 4495
+qpa dec 655 if yq == 2
+ow inc 433 if sd <= 1172
+ip inc 932 if ige != -2145
+qpa inc 256 if g == -2202
+ige inc -839 if qfz <= 916
+o inc 108 if yq <= 9
+myk dec 49 if ige >= -2983
+d dec -825 if keq < 1556
+hwk dec 756 if ige >= -2989
+tcy dec 17 if u == 131
+keq dec -841 if u >= 129
+scy inc -926 if si > -3897
+bio inc 880 if d > 4035
+sd inc -230 if qpa <= -3861
+si dec 782 if n <= -1808
+myk inc 998 if vt != -337
+hwk inc -363 if ljs < 3670
+qpa dec 349 if keq == 2389
+ip dec 17 if s <= 3736
+u dec -985 if ige != -2984
+zr dec 470 if hwk == -2731
+ige dec -767 if py <= 368
+yq dec 766 if keq >= 2385
+ige dec 790 if yq == -758
+cy inc 712 if ip > 1939
+qfz inc 379 if ljs != 3666
+py inc -287 if ljs == 3666
+cy inc 148 if gij > -220
+cy dec -389 if ip >= 1925
+s dec 405 if g == -2202
+ljs dec -95 if vt != -353
+sd dec -511 if qfz <= 912
+ljs dec -997 if gij < -204
+scy dec -731 if ow != -3698
+yq inc -383 if bio >= 3853
+myk inc -272 if tcy >= 4321
+py inc -162 if scy <= -2514
+g dec -975 if keq <= 2392
+bio dec -327 if n >= -1816
+u inc -309 if d == 4039
+scy inc -593 if cy > 1988
+bio dec 737 if cy >= 1990
+o inc 978 if o == 4603
+ow inc -788 if bio <= 3448
+qfz inc 568 if qpa != -4212
+gij dec 637 if cy <= 1998
+cy dec -603 if n == -1821
+ljs inc 642 if ip > 1925
+qpa inc 159 if ljs <= 5404
+ip inc 987 if cy == 1992
+d dec -499 if ige > -2225
+n inc -267 if gij != -857
+u dec 396 if cy >= 1987
+hwk inc -131 if vt < -335
+tcy dec 878 if gij != -841
+cy dec -269 if d >= 4530
+sd dec 706 if si >= -4670
+n dec 239 if pc <= 1594
+sd dec 318 if zr >= -274
+ow dec 897 if s <= 3330
+zr inc -891 if si >= -4661
+u dec 119 if gij != -853
+keq dec 427 if ige == -2215
+ige dec 185 if pc < 1596
+n inc 200 if py >= -90
+scy inc 289 if u == 292
+scy dec -570 if ige < -2390
+myk dec 676 if qpa == -4053
+yq dec 232 if sd < 434
+ljs dec 685 if yq != -1379
+n dec -747 if ow >= -5389
+bio dec 900 if ige < -2398
+hwk inc 106 if qfz != 906
+o inc -687 if u < 294
+sd inc 905 if sd > 430
+yq inc -405 if qpa == -4053
+u inc 871 if gij > -850
+pc dec -145 if hwk > -2760
+sd dec -673 if u >= 284
+si dec 407 if qpa > -4055
+ip dec 491 if s < 3329
+bio inc 90 if ige != -2404
+g dec 429 if ljs > 5398
+qpa inc -965 if o >= 4888
+s dec 419 if myk > 279
+cy inc 309 if scy != -2261
+u inc -585 if pc <= 1740
+myk inc 933 if ow >= -5382
+bio dec -959 if keq <= 1966
+zr inc -68 if d == 4538
+gij dec 418 if n <= -1127
+cy dec -537 if scy > -2260
+n dec -912 if scy <= -2251
+yq inc -880 if ow < -5382
+u dec -593 if yq <= -2663
+u dec -628 if qfz >= 907
+hwk dec -978 if keq == 1962
+py dec 286 if o > 4903
+o dec 626 if vt >= -349
+vt dec 244 if si >= -5079
+g inc -282 if ip <= 2428
+zr dec 729 if py >= -86
+pc dec 626 if vt >= -594
+myk inc -630 if u == 928
+bio inc -318 if ige <= -2393
+hwk dec -636 if bio <= 3272
+gij inc 4 if tcy != 3437
+d inc -633 if keq != 1954
+cy dec -845 if qfz > 909
+bio dec -701 if zr < -1060
+bio dec 33 if bio <= 3985
+gij dec -770 if scy == -2252
+o inc -301 if yq > -2673
+s inc -11 if s != 2903
+ip inc -527 if yq > -2674
+d dec -700 if scy < -2245
+o dec 157 if yq <= -2655
+g dec -914 if cy < 3962
+ige inc -380 if s < 2908
+qpa inc -37 if hwk != -1784
+pc inc 300 if keq == 1955
+s dec 259 if s < 2907
+yq inc 415 if cy < 3956
+d inc -713 if vt < -584
+si inc -257 if ip < 1902
+n dec 573 if ljs > 5398
+n dec -227 if py == -84
+cy dec -469 if zr <= -1062
+qfz inc -210 if ige != -2779
+myk dec -63 if ip < 1894
+keq inc 573 if gij <= -486
+tcy dec 552 if keq < 2528
+s inc 340 if qpa == -5055
+zr inc 258 if qfz == 700
+keq dec 528 if scy >= -2256
+g dec 876 if g < -1021
+si dec -939 if si < -5340
+cy dec 200 if py > -80
+qfz inc -714 if o <= 3814
+g inc -497 if yq > -2253
+bio dec -953 if ow > -5384
+g dec 215 if ljs < 5396
+yq dec 24 if ip > 1906
+n inc 371 if scy <= -2248
+o dec 264 if s < 2987
+s dec -428 if gij > -502
+ige dec 629 if yq <= -2242
+gij inc -461 if g <= -2393
+d dec -217 if u > 926
+cy dec -781 if u != 926
+hwk dec 929 if tcy < 3450
+u dec 835 if ip >= 1897
+tcy dec 753 if u < 99
+ow inc 592 if py >= -91
+ip dec -141 if pc != 1114
+tcy inc -295 if zr == -808
+o inc -627 if d == 4109
+cy inc 469 if bio != 4905
+vt inc -913 if vt != -587
+sd dec 242 if zr > -809
+qfz dec -166 if g > -2407
+s dec 375 if yq >= -2253
+scy inc -741 if qpa != -5051
+myk dec 358 if g >= -2406
+myk dec 873 if u != 90
+hwk dec -387 if qpa == -5061
+ow dec -360 if n < -431
+py inc -907 if yq < -2239
+pc dec -403 if myk >= -1576
+sd inc -788 if si > -5328
+qfz inc -95 if qfz > 158
+s inc -25 if si != -5337
+tcy inc -216 if qpa < -5054
+ow dec -542 if bio > 4899
+tcy dec 425 if hwk > -2707
+tcy inc -543 if ljs < 5404
+sd dec -200 if py < -989
+zr dec 421 if u <= 91
+d dec -522 if ljs != 5394
+cy inc -533 if ljs >= 5398
+vt inc -761 if py != -1001
+bio inc -888 if ige > -3419
+hwk inc -757 if gij == -956
+yq dec 982 if ip >= 1892
+scy dec 498 if myk != -1588
+sd dec -884 if o < 2922
+si dec 630 if qpa < -5047
+bio dec -509 if gij == -947
+vt dec 811 if pc >= 1113
+yq inc 973 if ow <= -4257
+s inc 564 if zr != -805
+qpa dec 40 if ow > -4259
+tcy dec -628 if u >= 93
+qfz inc -951 if qpa != -5105
+si dec 314 if py >= -994
+n dec 41 if scy >= -3497
+hwk inc -338 if pc > 1112
+cy inc -982 if g < -2387
+ow dec -651 if cy <= 4163
+sd inc 463 if g >= -2405
+yq dec -669 if qpa <= -5090
+zr inc -237 if ljs > 5393
+pc inc 594 if zr != -1047
+bio inc -336 if keq <= 2001
+py inc 303 if s < 3586
+tcy dec 239 if gij != -965
+tcy dec -514 if g > -2407
+cy dec 362 if scy > -3493
+ige dec 194 if o > 2917
+cy inc 547 if u != 91
+n inc 925 if si <= -6269
+ow dec -786 if py <= -687
+s inc 759 if zr != -1047
+py dec 844 if yq == -2562
+cy inc 640 if keq <= 2011
+zr inc 13 if d < 4634
+d dec -439 if o >= 2915
+u dec 616 if n >= 456
+myk dec -754 if tcy > 2541
+sd dec 166 if vt == -2153
+bio inc -776 if vt >= -2161
+ljs dec -616 if myk >= -1583
+zr inc 612 if ow < -2813
+vt dec 735 if ip >= 1896
+yq dec -856 if ige >= -3602
+zr dec 927 if py >= -1535
+u dec -416 if myk == -1579
+py dec -76 if sd < 2412
+myk dec -48 if ip >= 1905
+qfz dec 95 if o > 2912
+vt dec 810 if d != 5070
+qfz inc 89 if qfz > -896
+qfz dec -527 if scy > -3500
+bio inc -851 if keq > 2005
+u inc -43 if pc != 1704
+u dec -143 if scy != -3487
+gij dec 947 if sd >= 2411
+g dec 202 if ow <= -2810
+tcy dec 438 if bio != 2384
+n inc -784 if sd <= 2400
+ljs dec -64 if ip > 1893
+yq inc 951 if keq >= 2004
+bio dec -37 if vt == -2894
+ige dec -280 if o > 2917
+qpa dec -373 if ige == -3323
+qpa dec 697 if yq > -1617
+scy dec -430 if s < 4329
+zr inc -253 if g == -2599
+keq dec 339 if vt <= -2893
+g dec 703 if ljs <= 6078
+hwk dec -571 if vt == -2894
+ige dec -954 if o <= 2928
+keq dec 568 if o > 2914
+ljs inc -645 if scy >= -3498
+keq dec -827 if ljs != 5434
+cy dec 784 if g == -2599
+gij dec -47 if qpa == -5428
+hwk inc -260 if myk == -1579
+qpa dec -586 if g > -2608
+o dec -581 if hwk > -3486
+qpa inc -86 if o == 2919
+gij dec -946 if zr < -2210
+u dec 212 if ow == -2812
+ow dec 268 if qpa < -4915
+qpa inc 867 if hwk <= -3487
+py dec -844 if hwk == -3491
+g inc 35 if ow != -3078
+gij dec -783 if vt <= -2885
+u dec 57 if tcy >= 2097
+pc dec -465 if tcy >= 2103
+zr dec -262 if vt > -2904
+hwk inc 153 if myk < -1571
+si dec 295 if tcy >= 2092
+u inc -59 if u < -270
+sd dec 18 if gij != 769
+gij inc -803 if bio < 2417
+cy inc 523 if myk < -1579
+vt dec -929 if ip < 1909
+s dec -584 if ow < -3079
+hwk dec -717 if keq < 1931
+gij inc -114 if sd != 2386
+qfz inc -478 if tcy != 2092
+sd inc -322 if cy < 4198
+ige dec 271 if tcy >= 2106
+myk inc -298 if g != -2564
+zr dec 711 if pc >= 1707
+si dec -542 if sd < 2074
+vt dec 819 if scy <= -3493
+qfz inc 700 if ip >= 1891
+g inc 134 if sd < 2067
+qfz inc -572 if pc > 1703
+ow dec -770 if keq <= 1931
+o inc -63 if bio != 2422
+hwk inc 797 if py < -612
+qpa dec 679 if si >= -6031
+qfz inc 46 if bio == 2422
+g dec 182 if g < -2423
+vt inc 488 if o != 2926
+o dec -900 if cy > 4193
+zr inc -625 if d > 5070
+scy inc -64 if scy >= -3481
+s inc 958 if tcy >= 2091
+n inc -824 if myk != -1586
+n dec -601 if u > -338
+qfz inc 503 if s <= 5878
+hwk inc 445 if d >= 5074
+ow dec -123 if tcy != 2099
+s inc -160 if hwk >= -1831
+ige inc -959 if pc == 1708
+s dec 526 if d > 5062
+si inc -250 if pc > 1714
+scy dec -40 if n >= 233
+ow dec 909 if py == -614
+ow inc 147 if u <= -333
+sd inc -748 if pc > 1717
+qpa dec 303 if cy >= 4190
+qfz dec -347 if cy < 4206
+vt inc 575 if scy < -3458
+ow inc -59 if cy < 4201
+ow dec -701 if ip <= 1896
+qpa inc -666 if ige < -3318
+g dec -595 if ige == -3328
+sd dec 968 if u < -333
+d dec -135 if u > -334
+zr inc 501 if ljs != 5438
+qpa inc 126 if qfz >= 264
+ip dec 334 if keq > 1926
+si inc 979 if ljs >= 5427
+ip dec -474 if vt > -1485
+vt dec -262 if pc <= 1710
+u dec -960 if ige == -3328
+scy inc -621 if ow < -3125
+zr inc -256 if cy > 4189
+u inc -133 if sd == 1096
+si inc -53 if pc < 1706
+vt dec 695 if keq <= 1928
+zr inc 373 if hwk > -1833
+qpa dec -198 if ow >= -3139
+cy dec 636 if s != 5181
+ip inc -732 if sd <= 1105
+tcy inc -756 if tcy <= 2091
+zr dec 503 if py <= -618
+yq inc 451 if ip > 1298
+gij dec 391 if zr < -2033
+ow dec -258 if tcy <= 2106
+yq inc 957 if g != -2022
+gij dec 639 if u < 502
+sd dec 253 if vt < -1908
+tcy inc -882 if cy < 3570
+s dec 556 if gij != -256
+cy dec -820 if keq == 1927
+py inc 885 if d < 5078
+ige dec -207 if qpa != -5376
+scy dec -417 if py == 271
+g inc 45 if u >= 484
+o dec -198 if o <= 3824
+d dec -978 if pc >= 1705
+scy dec -770 if ip != 1310
+hwk dec -35 if hwk > -1826
+pc dec 470 if si > -5047
+n dec -141 if u > 483
+ow inc 244 if scy == -2885
+pc dec 538 if d <= 6055
+sd inc 289 if ow >= -2638
+keq inc -931 if ip != 1317
+py inc 746 if py != 278
+qfz dec -957 if si == -5051
+yq dec -374 if cy < 4377
+vt dec -749 if ljs >= 5426
+n inc 922 if bio != 2422
+scy dec 758 if s <= 4644
+qfz inc -739 if s <= 4635
+si inc 653 if s >= 4634
+d inc 297 if ow == -2629
+vt inc 963 if zr != -2033
+g inc 977 if si <= -4393
+myk dec -141 if qfz == 486
+s dec 68 if d == 6345
+zr inc 882 if s <= 4564
+cy inc -492 if pc == 1170
+myk dec -492 if ow <= -2633
+s dec -186 if cy <= 3893
+tcy inc -947 if hwk == -1789
+pc dec 455 if s > 4745
+gij dec 601 if n <= 370
+scy inc -688 if hwk < -1797
+scy inc 768 if qfz < 491
+myk inc -187 if qfz != 490
+g dec -732 if ow != -2629
+cy dec 355 if qfz != 480
+ip inc 901 if cy == 3534
+qfz dec 460 if yq != -203
+py dec 366 if d <= 6349
+qpa inc 474 if d > 6343
+keq dec -768 if tcy == 270
+gij inc 876 if ljs >= 5427
+tcy inc 617 if bio > 2419
+sd inc -649 if ljs != 5441
+ow dec -20 if gij < 627
+qfz dec 436 if vt <= -198
+pc dec -752 if d <= 6337
+ip dec 928 if scy < -2867
+qpa inc 780 if d > 6344
+bio inc 963 if n == 379
+ige inc 93 if gij != 620
+ige inc -185 if scy == -2875
+py inc -650 if qpa >= -4129
+ip dec -895 if gij < 621
+s dec -539 if ip != 2180
+py dec 71 if qpa >= -4127
+bio dec 229 if gij != 619
+yq dec 56 if vt > -205
+qfz dec -389 if sd != 485
+s dec -85 if cy < 3540
+ip inc 386 if yq < -253
+gij dec 571 if qpa != -4119
+ip inc -645 if bio == 3380
+qpa inc -822 if qpa < -4118
+ljs inc -43 if myk == -1625
+bio inc -462 if tcy == 887
+myk inc -717 if vt > -200
+scy dec 228 if myk != -2348
+myk dec -518 if myk <= -2336
+d inc -593 if si < -4397
+ip inc -912 if ige < -3428
+si inc -320 if vt <= -196
+n dec 997 if ige != -3420
+ip inc -801 if ip > 2557
+pc dec -526 if hwk < -1781
+ige dec -279 if ip <= 1762
+ow dec -488 if qfz >= 436
+scy inc 408 if qfz != 443
+gij inc -992 if scy <= -2691
+pc inc 238 if ige != -3143
+g inc 760 if scy >= -2697
+s dec -57 if hwk <= -1783
+si dec 368 if ip == 1760
+qfz dec 760 if vt >= -205
+myk dec 254 if u == 491
+sd inc -466 if myk <= -1818
+cy dec -64 if qfz != -331
+vt dec -632 if qpa == -4944
+gij inc 382 if zr == -2042
+py inc 585 if zr <= -2050
+n dec 612 if d < 5760
+o inc 673 if py <= -62
+u inc 986 if py <= -61
+ip dec 128 if gij == -954
+u inc -173 if ige <= -3140
+ip inc 358 if scy <= -2687
+o inc 114 if py > -67
+hwk dec -413 if n <= -233
+scy dec 979 if s == 5434
+myk inc -190 if py <= -62
+u dec 884 if hwk != -1376
+sd inc -711 if zr > -2038
+pc inc -292 if o <= 4690
+d inc -490 if d < 5749
+py dec 812 if ljs <= 5397
+keq dec -74 if qfz >= -324
+qfz dec 820 if ige >= -3149
+ow dec 629 if d >= 5746
+scy dec 481 if qfz != -1144
+gij dec 272 if ip == 2118
+keq inc -957 if scy == -4161
+ljs dec -974 if hwk == -1376
+gij dec 848 if sd < 20
+o inc -718 if scy >= -4160
+s dec 807 if g <= -244
+zr inc -12 if sd != 23
+ip dec 332 if sd >= 19
+sd inc -237 if ljs >= 6370
+o dec 105 if ow == -2750
+u inc -466 if qpa > -4950
+cy inc -11 if keq >= 1846
+gij dec 576 if scy > -4159
+py inc -470 if u == 834
+qfz inc 812 if vt != 434
+yq inc -447 if bio <= 2927
+qpa inc 983 if bio != 2926
+g dec -396 if py != -882
+qfz dec -504 if vt < 437
+d inc 202 if ip > 2121
+ip dec -112 if n < -230
+hwk inc -295 if keq <= 1845
+hwk dec -244 if d == 5752
+tcy inc 905 if n != -235
+ljs dec 901 if yq >= -710
+keq dec -871 if sd <= 20
+u inc -900 if s == 5434
+pc dec 916 if vt <= 426
diff --git a/day_8/src/main.rs b/day_8/src/main.rs
new file mode 100644
index 0000000..2460786
--- /dev/null
+++ b/day_8/src/main.rs
@@ -0,0 +1,151 @@
+use std::collections::HashMap;
+
+enum Operation {
+    Incr,
+    Decr,
+}
+
+enum Comparison {
+    Greater,
+    Equal,
+    Less,
+    LessEqual,
+    GreaterEqual,
+    NotEqual,
+}
+
+struct Condition<'a> {
+    register: &'a str,
+    comparison: Comparison,
+    number: i32,
+}
+
+struct Instruction<'a> {
+    register: &'a str,
+    op: Operation,
+    amount: i32,
+    condition: Condition<'a>,
+}
+
+fn parse(s: &str) -> Instruction {
+    let mut iter = s.split_whitespace();
+    let register = iter.next().unwrap();
+    let op = match iter.next().unwrap() {
+        "inc" => Operation::Incr,
+        "dec" => Operation::Decr,
+        s => panic!("Bad! {}", s),
+    };
+    let amount: i32 = iter.next().unwrap().parse().unwrap();
+    let if_clause = iter.next().unwrap();
+    if if_clause != "if" {
+        panic!("Expected 'if', got: {}", if_clause);
+    }
+    let cmp_variable = iter.next().unwrap();
+    let cmp_operator = match iter.next().unwrap() {
+        "<=" => Comparison::LessEqual,
+        ">=" => Comparison::GreaterEqual,
+        "==" => Comparison::Equal,
+        "<" => Comparison::Less,
+        ">" => Comparison::Greater,
+        "!=" => Comparison::NotEqual,
+        s => panic!("Expected comparison, got: {}", s),
+    };
+    let cmp_num: i32 = iter.next().unwrap().parse().unwrap();
+    let condition = Condition {
+        register: cmp_variable,
+        comparison: cmp_operator,
+        number: cmp_num,
+    };
+    match iter.next() {
+        None => Instruction {
+            register,
+            op,
+            amount,
+            condition,
+        },
+        Some(s) => panic!("Exp ected end of line, got {}", s),
+    }
+}
+
+fn input() -> Vec<Instruction<'static>> {
+    let input = include_str!("../input.txt");
+    input.lines().map(|l| parse(l)).collect::<Vec<_>>()
+}
+
+fn process<'a>(instructions: &[Instruction<'a>]) -> HashMap<&'a str, (i32, i32)> {
+    let mut registers = HashMap::new();
+    for instruction in instructions {
+        let original = registers
+            .get(instruction.condition.register)
+            .map_or(0, |&(_, v)| v);
+        let proceed = match instruction.condition.comparison {
+            Comparison::Greater => original > instruction.condition.number,
+            Comparison::Less => original < instruction.condition.number,
+            Comparison::GreaterEqual => original >= instruction.condition.number,
+            Comparison::LessEqual => original <= instruction.condition.number,
+            Comparison::Equal => original == instruction.condition.number,
+            Comparison::NotEqual => original != instruction.condition.number,
+        };
+        if proceed {
+            let (original_max, original_val) =
+                registers.get(instruction.register).map_or((0, 0), |i| *i);
+            let new_val = match instruction.op {
+                Operation::Incr => original_val + instruction.amount,
+                Operation::Decr => original_val - instruction.amount,
+            };
+            let new_max = std::cmp::max(original_max, new_val);
+            registers.insert(instruction.register, (new_max, new_val));
+        }
+    }
+    registers
+}
+
+fn part_1(instructions: &[Instruction]) -> i32 {
+    let map = process(instructions);
+    map.values().map(|&(_, i)| i).max().unwrap()
+}
+
+fn part_2(instructions: &[Instruction]) -> i32 {
+    let map = process(instructions);
+    map.values().map(|&(i, _)| i).max().unwrap()
+}
+
+fn main() {
+    let input = input();
+    println!("part 1 => {}", part_1(&input));
+    println!("part 2 => {}", part_2(&input));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn data() -> Vec<Instruction<'static>> {
+        vec![
+            "b inc 5 if a > 1",
+            "a inc 1 if b < 5",
+            "c dec -10 if a >= 1",
+            "c inc -20 if c == 10",
+        ]
+        .iter()
+        .map(|s| parse(s))
+        .collect()
+    }
+
+    #[test]
+    fn part1_known() {
+        assert_eq!(part_1(&data()), 1);
+    }
+
+    #[test]
+    fn part2_known() {
+        assert_eq!(part_2(&data()), 10);
+    }
+
+    #[test]
+    fn test_day_1() {
+        let input = input();
+        assert_eq!(part_1(&input), 5752);
+        assert_eq!(part_2(&input), 6366);
+    }
+}