#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  ll n,a=2;cin>>n;
  int res=0;
  while(n>=a*a){
    if(n%a==0){
      n/=a;
      res++;
    }else{
      a++;
    }
  }
  if(res!=1)res++;
  cout<<(res<3?"YES":"NO")<<endl;
}