#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if (n%2) cout<<"n o"<<endl;
	else cout<<"y e s"<<endl;	
	return 0;
}
/**************************************************************
	Problem: 1033
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/