#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n <= 10 || n > 21) {
    cout << 0;
    return 0;
  }
  if (n - 10 < 10 || n - 10 == 11)
    cout << 4;
  else
    cout << 15;
  return 0;
}
