using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}int A=0, B=0, command= 0;

        while (command !=6){

        Console.WriteLine("----------console calcualator----------\n");

            Console.WriteLine("1.Enter A . B :");

            Console.WriteLine("2.CALS A + B :");

            Console.WriteLine("3.CALS A * B :");

            Console.WriteLine("4.CALS A / B :");

            Console.WriteLine("5.CALS A - B :");

            Console.WriteLine("6.EXIT:");

            Console.WriteLine("=========================================");

            command = int.Parse(Console.ReadLine());

            if(command ==1){

            A=int.Parse(Console.ReadLine());

            B=int.Parse(Console.ReadLine());

            }

            Console.WriteLine("A={0}  B={1}",A,B);

            Console.WriteLine("==========================================");

            Console.WriteLine("Enter number (1-6)");

            if (command == 2){

               Console.WriteLine("A + B = {0}", A+B);

            }else if(command == 3){

                Console.WriteLine("A * B = {0}", A*B);

            }else if(command == 4){

                if (B !=0){

                    Console.WriteLine("A / B = {0}", A/B); 

                }

            }else if(command == 5){

                Console.WriteLine("A - B = {0}", A-B);

        }else if(command == 6){

                break;

            }else{

            Console.WriteLine("Bad command");

            }

    }

    }

}