Cake

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

namespace DomashnoCake
{
    class Program
    {
        static void Main(string[] args)
        {
            int cakeHight = int.Parse(Console.ReadLine());
            int cakeLenght = int.Parse(Console.ReadLine());

            int numberPieces = cakeHight * cakeLenght;

            while (true)
            {
                if (numberPieces < 0)
                {
                    break;
                }
                else
                {
                    string command = Console.ReadLine();

                    if (command == "STOP")
                    {
                        break;
                    }
                    else
                    {
                        int piecesTaken = int.Parse(command);

                        numberPieces -= piecesTaken;

                    }
                }
            }

            if (numberPieces > 0)
            {
                Console.WriteLine($"{numberPieces} pieces are left.");
            }
            else
            {
                int piecesNeeded = Math.Abs(numberPieces);

                Console.WriteLine($"No more cake left! You need {piecesNeeded} pieces more.");
            }

        }
    }
}