using System;

public class hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        getAns(n);
    }
    static void getAns (int n)
    {
        if (n == 2) { Console.WriteLine("YES"); return; }
        for (int i = 3; i * i <= n; i+= 2)
        {
            if (n % i == 0) { Console.WriteLine("YES"); return; }
        }
        Console.WriteLine("NO");
    }
}