#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  n -= 10;
  if (n > 0 && n < 12) {
    if (n == 10)
      cout << 15 << endl;
    else
      cout << 4 << endl;
  } else
    cout << 0 << endl;
  return 0;
}
