#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%2==0){
		cout<<"yes";
	}else cout<<"no";
	return 0;
}
	
/**************************************************************
	Problem: 1033
	User: panjinyan
	Language: C++
	Result: Wrong Answer
****************************************************************/