#include <bits/stdc++.h>
using namespace std;
int k[38];
int main() {
  int i, n;
  memset(k, 0, sizeof(k));
  for (i = 11; i < 20; i++) k[i] = 4;
  k[20] = 15;
  k[21] = 4;
  while (scanf("%d", &n) != EOF) printf("%d\n", k[n]);
  return 0;
}
