cake programing basics

using System;


    class Program
    {
        static void Main()
        {
            int length = int.Parse(Console.ReadLine());
            int width = int.Parse(Console.ReadLine());
            int cake = length * width;
            string input;
            bool cakeleft=true;
            while ((input=Console.ReadLine())!= "Stop" && cakeleft)
            {
                 int  pieces = int.Parse(input);
                 cake -= pieces;
                 cakeleft = cake - pieces > 0;
            }

            if (input == "Stop")
            {
                Console.WriteLine("{0} pieces are left.",cake);
            }
            else
            {
                Console.WriteLine("No more cake left.You need {0} piece more.",Math.Abs(cake));
            }

        }
    }