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