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