using System;

public class Program

{

    public static void Main()

    {

        int n=0,m=0,c;

         Console.WriteLine("1. Read the numbers \n");

        menu:Console.WriteLine("2. Addition \n");

        Console.WriteLine("3. Subtraction \n");

        Console.WriteLine("4. Multiplication \n");

        Console.WriteLine("5. Division \n");

        Console.WriteLine("6. Exit\n");

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

        switch(c)

        {

                case 1:

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

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

                goto menu;

                break;

            case 2:

                Console.WriteLine("addition of {0} + {0} is {0}",n,m, n+m);

                break;

            case 3:

                Console.WriteLine("subtraction of {0} - {0} is {0}",n,m, n-m);

                break;

            case 4:

                Console.WriteLine("Multiplication of {0} * {0} is {0}", n,m,n*m);

                break;

            case 5:

                Console.WriteLine("Division  of {0} / {0} is {0}", n,m,n/m);

                break;

            case 6:

            break;

     }

}}