#include <bits/stdc++.h>
using namespace std;
int n;
int main() {
  cin >> n;
  n -= 10;
  if (n >= 1 && n <= 9 || n == 11)
    cout << 4;
  else if (n == 10)
    cout << 15;
  else
    cout << 0;
  return 0;
}
