using System;

public class f1
{
    private const int N = 2117;

    [Benchmark]
    public static int NoCheck()
    {
      int i = 0;
      int x = 1;
      while (i < N) {
        int j = 0;
        while (j <= i) {
          j = j + 1;
          x = x + (i&j);
        }
        i = i + 1;
      }
      return x;
    }

    [Benchmark]
    public static int OvfCheck()
    {
      int i = 0;
      int x = 1;
      while (i < N) {
        int j = 0;
        while (j <= i) {
          try {
            j = checked(j + 1);
          }
          catch(OverflowException) {
            return -1;
          }

          int tmp = (i&j);

          try {
            x = checked(x + tmp);
          }
          catch(OverflowException) {
            return -1;
          }
        }

        try {
          i = checked(i + 1);
        }
        catch(OverflowException) {
          return -1;
        }
      }
      return x;
    }
}