#include <bits/stdc++.h>
using namespace std;
long long mod = 1000000000 + 7;
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int n;
  cin >> n;
  n -= 10;
  if (n >= 1 && n <= 11 && n != 10) {
    cout << 4;
  } else if (n == 10) {
    cout << 15;
  } else {
    cout << 0;
  }
  return 0;
}
