using System;

public class Program

{

    public static void Main()

    {

        int num1 = 1;

        int num2 = 1;

        int option = 5;

        decimal ans;

        switch(option)

        {

            case 1:

                ans = num1 + num2;

                Console.WriteLine("The addition of {0} and {1} is : {2}", num1, num2, ans);

                break;

            case 2:

                ans = num1 - num2;

                Console.WriteLine("The subtraction of {0} and {1} is : {2}", num1, num2, ans);

                break;

            case 3:

                ans = num1 * num2;

                Console.WriteLine("The multiplication of {0} and {1} is : {2}", num1, num2, ans);

                break;

            case 4:

                ans = num1 / num2;

                Console.WriteLine("The division of {0} and {1} is : {2}", num1, num2, ans);

                break;

            default:

                Console.WriteLine("EXIT");

                break;

        }

    }

}