自己看

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,ans=0;
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	std::cout.tie(nullptr);
	cin>>n;
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=n;j++){
            if(i*j==n) ans++;
        }
    }
    if(ans==3){
        cout<<"YES"<<endl;
    }else{
        cout<<"NO"<<endl;
    }
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}
//coder::by::M91