Problem: 

Input

The input contains a single integer a (0 ≤ a ≤ 35).

Output

Output a single integer.

Examples

Input

3


Output

8


Input

10


Output

1024

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
int n, rnk[16];
int main() {
  scanf("%d", &n);
  for (int i = 0; i < 16; i++) rnk[i] = i;
  for (int j = 8; j; j >>= 1)
    for (int i = 0; i < j << 1; i++) rnk[i] ^= j;
  printf("%d\n", rnk[n]);
}