#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	cout<<(n%2==0?"y e s":"n o");
	return 0;
}

/**************************************************************
	Problem: 1033
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/