using System;

public class Program

{

    public static void Main()

    {

        int num1,num2;

        string op;

        Console.WriteLine("enter two numbers:");

        num1=Convert.ToInt32(Console.ReadLine());

        num2=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("enter the operation to be performed:");

        op=Console.ReadLine();

        switch(op)

        {

            case "sum":Console.WriteLine("sum of two numbers:{0}",num1+num2);

            break;

            case "sub":Console.WriteLine("difference between two nnumbers:{0}",num1-num2);

            break;

            case "mul":Console.WriteLine("product of two numbers:{0}",num1*num2);

            break;

            case "div":Console.WriteLine("quotient of two numbers:{0}",num1/num2);

            break;

            case "mod":Console.WriteLine("remainder of two numbers:{0}",num1%num2);

            break;

            default:Console.WriteLine("please enter the correct operation");

            break;

        }

    }

}