using System;

public class Program

{

    public static void Main()

    {

        bool quit = false;

        while(! quit)

        {

            Console.WriteLine("Enter num 1");

            int num1 = int.Parse(Console.ReadLine());

            Console.WriteLine("Enter num 2");

            int num2 = int.Parse(Console.ReadLine());

            Console.WriteLine("Please enter a mathematical sign(e.g. +, -, *, / or the letter Q to quit)");

            string sign = Console.ReadLine();

            switch(sign)

            {

                case "+":

                    Console.WriteLine(num1 + num2);

                    break;

                case "-":

                    Console.WriteLine(num1 - num2);

                    break;

                case "*":

                    Console.WriteLine(num1 *num2);

                    break;

                case "/":

                    Console.WriteLine(num1 / num2);

                    break;

                case "Q":

                    quit = true;

                    break;

            }

        }

    }

}