P014.Main C# (CSharp) Method

    public static void Main()
    {
        Euler.run(() => {
          long idx = 0;
          long max = 0;

          for (long i = 1; i <= 1000000; i++) {
        long length = collatz(i);
        if (max < length) {
          idx = i;
          max = length;
        }
          }

          return idx;
        });
    }