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() {
  int n;
  cin >> n;
  n = n ^ 8;
  if (n > 7) {
    n = n ^ 4;
  }
  if (n > 11) {
    n = n ^ 2;
  }
  if (n > 13) {
    n = n ^ 1;
  }
  cout << n;
}