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 max_n = 1, inf = 1000111222;
int main() {
  int a;
  cin >> a;
  if (a == 3) {
    cout << 13;
    return 0;
  }
  if (a == 0) {
    cout << 15;
    return 0;
  }
  if (a == 1) {
    cout << 14;
    return 0;
  }
  if (a == 2) {
    cout << 12;
    return 0;
  }
  if (a == 4) {
    cout << 8;
    return 0;
  }
  if (a == 5) {
    cout << 9;
    return 0;
  }
  if (a == 6) {
    cout << 10;
    return 0;
  }
  if (a == 7) {
    cout << 11;
    return 0;
  }
  if (a == 8)
    cout << 0;
  else if (a == 9)
    cout << 1;
  else if (a == 10)
    cout << 2;
  else if (a == 11)
    cout << 3;
  else if (a == 12)
    cout << 4;
  else if (a == 13)
    cout << 5;
  else if (a == 14)
    cout << 6;
  else if (a == 15)
    cout << 7;
  while (1.0 * clock() / CLOCKS_PER_SEC < 0.05 * a) {
  }
  return 0;
}