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>
using namespace std;
int main() {
  long long int n;
  cin >> n;
  n ^= 8;
  if (n >= 8) n ^= 4;
  if (n >= 12) n ^= 2;
  if (n >= 14) n ^= 1;
  cout << n << endl;
  return 0;
}