#include<iostream>

using namespace std;

bool is_prime(int n){
    if(n == 2 || n == 3) return true;
    else if(n % 2 == 0 || n % 3 == 0) return false;
    else{
        for(int i=5;i*i <= n;i+=2){
            if(n % i == 0) return false;
        }
    }
    return true;
}

int main(){
    int N;
    cin >> N;
    if(is_prime(N)) cout << "NO" << endl;
    else cout << "YES" << endl;
}