#include <bits/stdc++.h>
using namespace std;
int main()
{
	int num[26] = { 0,0,0,0,0,1,1,1,1,3,3,3,6,6,10,10,15,21,21,28,28,35,30,30,27,12 };
	int k;
	cin >> k;
	cout << num[k];
	return 0;
}