using System;

public class operations

{

    public int add(int a,int b){

    return a+b;

    }

    public int sub(int a,int b){

        return a-b;

    }

    public int mul(int a,int b){

        return a*b;

    }

    public int div(int a,int b){

        return a/b;

    }

}                   

public class switchcase

{

    public static void Main()

    {

        int a = Convert.ToInt32(Console.ReadLine());

        int b = Convert.ToInt32(Console.ReadLine());

        operations o = new operations();

        bool choice_to = false;

        while (choice_to == false){

        Console.WriteLine("Enter your choice:");

        string choice = Console.ReadLine();

        switch(choice){

            case "add":

                Console.WriteLine("The sum of given two numbers is " + o.add(a,b));

                break;

            case "sub":

                Console.WriteLine("The diffrence of given two numbers is " + o.sub(a,b));

                break;

            case "mul":

                Console.WriteLine("The product of given two numbers is " + o.mul(a,b));

                break;

            case "div":

                Console.WriteLine("The division of given two numbers is " + o.div(a,b));

                break;

            }

        Console.WriteLine("Enter yes to continue or no to leave");

        string c = Console.ReadLine();

        if (c=="no"){

            Console.WriteLine("poitu vanga tata!!!");

            choice_to = true;

        }

        }

    }

}