CSLight #26

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSLight
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> array = new List<int>();
            string userInput;
            int digit;
            int sum;
            bool isRunning = true;

            while (isRunning)
            {
                userInput = Console.ReadLine().ToLower();

                if (int.TryParse(userInput, out digit))
                {
                    array.Add(digit);
                    continue;
                }

                if (userInput == "sum")
                {
                    sum = 0;
                    for (int i = 0; i < array.Count; i++)
                    {
                        sum += array[i];
                    }
                    Console.WriteLine($"Сумма = {sum}");
                    continue;
                }

                if (userInput == "exit")
                {
                    isRunning = false;
                    continue;
                }

                Console.WriteLine("Повторите ввод:");
            }

            Console.WriteLine("Конец");
            Console.ReadKey();
        }
    }
}