#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  n = n - 10;
  if (n > 1 && n < 10) {
    cout << 4 << endl;
  } else if (n == 1 || n == 11) {
    cout << 4 << endl;
  } else if (n == 10) {
    cout << 15 << endl;
  } else
    cout << 0 << endl;
}
