12
 1378
 51202278
 989898989
 4
 7
 9
 6
 8
 12193721
 999999995
 999999999
 11
 999999996
 999999998
 3
 14
 15
 10
 999999994
 1000
 13781378
 5
 999999997
 1000000000
 13
 16
 0

6
 4
 4
 8
 6
 2
 8
 4
 6
 8
 2
 2
 2
 6
 4
 2
 4
 2
 4
 4
 6
 4
 8
 8
 6
 8
 6
 1

#include <bits/stdc++.h>
int main() {
  long long a, b, x, i;
  scanf("%I64d", &a);
  if (a % 2 == 0) {
    printf("4");
  } else {
    for (i = 1; i <= 30; i++) {
      x = pow(2, i) + 1;
      b = pow(2, i) - 1;
      if (a == x) {
        printf("8");
        break;
      } else if (a == b) {
        printf("2");
        break;
      }
    }
  }
}
