using System.Text.RegularExpressions;
// string input = "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))";
string input = File.ReadAllText("input.txt").ReplaceLineEndings("");
int total = 0;

Regex valid = new Regex(@"mul\((?<x>[0-9]+),(?<y>[0-9]+)\)");
Regex dontandDo = new Regex(@"(don\'t\(\).*?do\(\))");

input = dontandDo.Replace(input, "");
int muls = valid.Count(input);

List<(int x, int y)> multiplies = new();

foreach (Match match in valid.Matches(input))
{
    string x = match.Groups["x"].Value;
    string y = match.Groups["y"].Value;
    multiplies.Add((int.Parse(x), int.Parse(y)));
}

foreach ((int x, int y) in multiplies)
{
    total += x * y;
}

Console.WriteLine($"muls: {muls}");