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;
static const int maxn = 100010;
static const int INF = 0x3f3f3f3f;
static const int mod = (int)1e9 + 7;
static const double eps = 1e-6;
static const double pi = acos(-1);
void redirect() {}
int main() {
  redirect();
  int n;
  scanf("%d", &n);
  n ^= 8;
  if (n >= 8) n ^= 4;
  if (n >= 12) n ^= 2;
  if (n >= 14) n ^= 1;
  printf("%d\n", n);
  return 0;
}