using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        long n = long.Parse(Console.ReadLine());
        if(!IsPrime(n))
        {
            Console.WriteLine($"YES");
        }
        else
        {
            Console.WriteLine($"NO");
        }
    }

    public static bool IsPrime(long number)
    {
        if(number <= 2)
            return true;
        else if(number % 2 == 0)
            return false;

        for(long i = 3; i <= number; i += 2)
        {
            if(number % i == 0)
            {
                return false;
            }
        }
        return true;
    }
}