//Write a program and continuously ask the user to enter a number or "ok" to exit. 

//Calculate the sum of all the previously entered numbers and display it on the console.

​

using System;

public class Program

{

    public static void Main()

    {

        int input = 0;

        int total = 0;

        for(int i = 1 ; i > 0  ; i++)

        {

            Console.WriteLine("Please add an integer value less than 20");

            string test  = Console.ReadLine().ToLower();

            if (test == "ok")

            {               

                 break;

            }                   

            else

            {

                input = int.Parse(test);

                total = total + input;

            }   

        Console.WriteLine(total);

        }

    }

}