#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long int n, m, a = 0, b = 0, c = 0, d, h, p, x, y, z, i = 0, j = 0,
                      k = 0, l, r, rem, time = 0, ans = 0, mini = 1e18 + 1,
                      maxi = 0, count = 0, sum = 0, sign = 0, xx, yy, zz;
  cin >> n;
  if (n >= 22 || n <= 10)
    cout << "0"
         << "\n";
  else if (n > 10 && n < 20 || n == 21)
    cout << "4"
         << "\n";
  else if (n == 20)
    cout << "15"
         << "\n";
}
void fast() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
}
int main() {
  fast();
  int t = 1;
  while (t--) {
    solve();
  }
  return 0;
}
