#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if ((n >= 0 and n <= 10) or (n >= 22 and n <= 25)) {
    cout << 0;
    return 0;
  }
  if (n == 11 or n == 21 or (n >= 12 and n <= 19)) {
    cout << 4;
    return 0;
  }
  if (n == 20) {
    cout << 15;
    return 0;
  }
}
