Chef and Parole

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;
	if(n < 1 || n > 30)
	{
	    return 0;
	}
	if(n >= 7)
	{
	    cout << "Yes"; 
	}else
	{
	    cout << "NO";
	}

}