#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a;
  cin >> n;
  if (n <= 10 || n > 21) {
    cout << 0;
    exit(0);
  }
  a = n - 10;
  if (a == 10) {
    cout << 15;
  } else {
    cout << 4;
  }
}
