#include<bits/stdc++.h>
using namespace std;
long long n;
bool Judge(long long num){
    if(num<=1)return 1;
    for(long long i=2;i*i<=num;i++)if(num%i==0)return 0;
    return 1;
}
int main(){
    cin>>n;
    cout<<(Judge(n)?"NO":"YES");
}