#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:256000000")
using namespace std;
const long double EPS = 1e-12;
const long long maxx = 4e6 + 7;
int n;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  if (n - 10 < 1) {
    cout << 0;
    return 0;
  }
  if (n - 10 == 10) {
    cout << 15;
    return 0;
  }
  if (n - 10 > 11) {
    cout << 0;
    return 0;
  }
  cout << 4;
  return 0;
}
