#include <bits/stdc++.h>
using namespace std;
map<int, int> m;
int main(int argc, char *argv[]) {
  int i, n;
  scanf("%d", &n);
  n = n - 10;
  for (i = 1; i <= 9; i++) {
    m[i] = 4;
  }
  m[10] = 15, m[11] = 4;
  printf("%d\n", m[n]);
  return 0;
}
