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