#include <bits/stdc++.h>
using namespace std; typedef long long ll;
int main() {
ll N; cin >> N;
int cnt=0;
for(ll i=2;i*i<=N;i++) {
while(N%i==0){cnt++;N/=i;}
}
if(N>1) cnt++; if(cnt<=2)cout<<"NO\n";else cout<<"YES\n";
return 0;
}