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

namespace ABC114A
{
    class Program
    {
        static void Main(string[] args)
        {
            int x = int.Parse(Console.ReadLine());


            if (x == 3 || x == 5 || x == 7)
                Console.WriteLine("YES");

            else
                Console.WriteLine("NO");

            Console.ReadKey();
        }
    }
}
