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;
const int oo = 0x3f3f3f3f;
const double pi = acos(-1);
const double eps = 1e-9;
int L[] = {15, 14, 12, 13, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7};
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  cout << L[n] << '\n';
  return 0;
}