#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n;
  cin >> n;
  if ((n - 10) == 10) {
    cout << 15;
  } else if (n - 10 <= 0 || n - 10 >= 12)
    cout << 0;
  else
    cout << 4;
  cout << "\n";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  solve();
  return 0;
}
