#include <bits/stdc++.h>
using namespace std;
int main() {
  setlocale(LC_ALL, "Russian");
  int n;
  cin >> n;
  n = n - 10;
  if (n == 10) {
    cout << 15;
  } else if (n >= 1 && n <= 9 || n == 11) {
    cout << 4;
  } else {
    cout << 0;
  }
}
