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


    class Program
    {
        static string degree(ulong n) {
            while (n % 2 == 0 & n >= 1)
            {
                n = n / 2;
            }
            if (n == 1)
            {
                return "YES";
            }
            else
            {
                return "NO";
            }

        }
        static void Main()
        {
        ulong n;
        string input = Console.ReadLine();
        if (!ulong.TryParse(input, out n))
        {
            Console.WriteLine("wrong");
        }
        else {
            Console.WriteLine(degree(n));
        }
        }
    }