#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){	
	
	long long A;
	cin>>A;
	
	if(A==1)cout<<"NO"<<endl;
	else cout<<"YES"<<endl;
	
    return 0;
}