using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());

        int[] range = (new int[N]).Select((i, index) => index).ToArray();

        int zero = range.Min();
        var rr = range.Where(i => i != zero).ToArray();
        if (rr.Length == zero)
        {
            Console.WriteLine("NO");
            return;
        }
        int one = rr.Min();
        rr = rr.Where(i => i != one).ToArray();
        foreach(int i in rr)
        {
            if (N % i == zero)
            {
                Console.WriteLine("NO");
                return;
            }
        }
        Console.WriteLine("YES");
    }
}