#include <bits/stdc++.h>
using namespace std;
int main() {
  int num;
  cin >> num;
  if (num <= 10 || num >= 22)
    cout << 0 << endl;
  else if (num == 20)
    cout << 15 << endl;
  else
    cout << 4 << endl;
  return 0;
}
