using System;

public class Program

{

    public static void Main()

    {

        int N,b,a;                                                       

        Console.WriteLine("enter number:");

        N = Convert.ToInt32(Console.ReadLine());

        b = 1;

        a = 0;

          for (int i = 1; i < N; i = i + 1)

    {         

                 b = b * 2;

         if( N == b )

         {

             a = N;

             }

              else {

              }

        }

        if( N == a )

    Console.WriteLine ("Binary number: "  + N);

        else {

            Console.WriteLine ( "No binary ");

        }

    }   

}