#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */

int main(void)
{
   ull i=1,j,k;
   ull n;
   cin >> n;
   char cnt = 0;
   for(j=2;j*j <= n;j++)
   {
      if(n % j == 0) cnt += 2;
   }
   if(cnt > 2) cout << "YES" << endl;
   else cout << "NO" << endl;

   return 0;
}