Write an application named SumInts that allows the user to enter any number of integers continuously until the user enters 999. Display the sum of the values entered, not including 999

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using static System.Console;

namespace SumInts
{
    class SumInts
    {
        static void Main(string[] args)
        {
            WriteLine("SumInts");
            int count = 0;
            int entry = 0;
            int sum = 0;
            while (entry != 999) //backup check
            {
                count++;
                Write("Enter number {0}:", count);
                entry = int.Parse(ReadLine());
                if (entry == 999) break;
                sum += entry;
            }
            WriteLine("Sum:{0}", sum);

            WriteLine("--End--");
        }
    }
}