#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, i, j, k, ar[20];
  for (i = 1; i <= 11; i++) {
    ar[i] = 4;
  }
  ar[10] = 15;
  cin >> a;
  b = (a - 10);
  for (i = 1; i <= 11; i++) {
    if (i == b) {
      cout << ar[i];
      return 0;
    }
  }
  cout << "0";
}
