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