#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using namespace std;
using ll = long long;
using ull = unsigned long long;

const long double inf = 1e9 + 7;

int main(){	
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	int a;
	cin >> a;
	if(a % 2 == 1){
		cout << "YES" << endl;
		return 0;
	}else{
		for(int i = 3; i*i <= a; i += 2){
			if(a % i == 0){
				cout << "YES" << endl;
				return 0;
			}
		}
	}
	cout << "NO" << endl;
	return 0;
}