diff --git a/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day4.fs b/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day4.fs
index 1f10a48..4a3f71b 100644
--- a/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day4.fs
+++ b/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day4.fs
@@ -1,16 +1,17 @@
 namespace AdventOfCode2023
 
 open System
+open System.Globalization
 
 [<RequireQualifiedAccess>]
 module Day4 =
 
     let inline parseByte (chars : ReadOnlySpan<char>) : byte =
-        // Byte.Parse (chars, NumberStyles.None, NumberFormatInfo.InvariantInfo)
-        let mutable answer = 0uy
-        for c in chars do
-            answer <- answer * 10uy + (byte c - 48uy)
-        answer
+        Byte.Parse (chars, NumberStyles.None, NumberFormatInfo.InvariantInfo)
+        //let mutable answer = 0uy
+        //for c in chars do
+        //    answer <- answer * 10uy + (byte c - 48uy)
+        //answer
 
     let part1 (s : string) =
         use lines = StringSplitEnumerator.make '\n' s