using System;

public class Program

{

     static void Main(string[] args)

     {

​

 do

​

 {

​

 Console.Write("x = ");

​

 string str = Console.ReadLine();

​

 if (str == "exit")

​

 {

​

 Console.WriteLine("Program has stopped");

​

 break;

​

 }

​

 else

​

 {

​

 int x = Convert.ToInt32(str);

​

 Console.Write("y = ");

​

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

​

 int sum = x + y;

​

 Console.WriteLine("Result: {0}", sum);

​

 }

​

 }

​

 while (true);

​

}

​

​