#include<iostream>
using namespace std;
#define int long long int
bool isprime(int n)
{
	if(n==2)return true;
	else if(n%2==0)return false;
	for(int i=3;i*i<=n;i+=2)if(n%i==0)return false;
	return true;
}
signed main()
{
	int n;cin>>n;
	if(isprime(n))cout<<"NO"<<endl;
	else cout<<"YES"<<endl;
	return 0;
}