using System;

​

public class Program

{

    public static void Main()

    {

        int a = 6;

        int b = 6;

        if ((a == b) && (a + b == 12))

        {

            Console.WriteLine("both a and b are 6");

        }

        else

        {

        if ((a == 6) || (b == 6))

        {

            Console.WriteLine("one of them is 6");

        }

        else

        {

            Console.WriteLine("non of them is 6");

        }

        }

    }

}