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;
template <class T>
inline void read(T &f) {
  f = 0;
  T x = 1;
  char ch = getchar();
  while (ch < 48 || ch > 57) {
    if (ch == '-') {
      x = -1;
    }
    ch = getchar();
  }
  while (ch <= 57 && ch >= 48) {
    f = f * 10 + ch - '0';
    ch = getchar();
  }
  f *= x;
}
const long long k[17] = {15, 14, 12, 13, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7};
int main() {
  long long n;
  read(n);
  cout << k[n] << endl;
  return 0;
}