using System;

public class Program

{

    public static void Main()

    {

        bool? flag = false; 

        if((bool)flag)

        {

            Console.WriteLine("flag is true");

        }

        else

        {

            if((bool)!flag)

            {

                Console.WriteLine("flag is false");

            }

            if(!(bool)flag)

            {

                Console.WriteLine("flag is again false");

            }

        }

    }

}