<image>

Input

The input contains a single integer a (0 ≤ a ≤ 15).

Output

Output a single integer.

Example

Input


3


Output


13
#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  n ^= 8;
  if ((n & 8) == 8) n ^= 4;
  if ((n & 12) == 12) n ^= 2;
  if ((n & 14) == 14) n ^= 1;
  cout << n << '\n';
}
