using System;

public class Program

{

    public static void Main()

    {

        int x,y;

        Console.Write("Emter the number");

        x=Convert.ToInt16(Console.ReadLine());

        Console.Write("Emter the another number");

        y=Convert.ToInt16(Console.ReadLine());

        Console.WriteLine("1.add");

        Console.WriteLine("2.sub");

        Console.WriteLine("3.multiply");

        Console.WriteLine("4.divide");

        int c=Convert.ToInt16(Console.ReadLine());

    switch(c)

    {

        case 1:

        Console.WriteLine("addition of two number is"+(x+y));

        break;

        case 2:

        Console.Write("subtraction of two numbers is"+(x-y));

        break;

        case 3:

        Console.WriteLine("multiplication of two numbers is"+(x*y));

        break;

        case 4:

        Console.WriteLine("Division of two numbers is"+(x/y));

        break;

        default:

        Console.WriteLine("Enter the valid option");

        break;

    }

}

}