#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a%2==0)
		cout<<"yes";
	return 0;
}

/**************************************************************
	Problem: 1640
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:5 ms
	Memory:2072 kb
****************************************************************/