cake

using System;

namespace homeworkloops2
{
    class Program
    {
        static void Main(string[] args)
        {
            int width = int.Parse(Console.ReadLine());
            int length = int.Parse(Console.ReadLine());

            int cakeArea = width * length;


            int cakeSum = 0;

            while (cakeArea > cakeSum)
            {
                var pieceOfCake = Console.ReadLine();

                if (pieceOfCake == "STOP")
                {
                    break;
                }
                else
                {
                    cakeSum += int.Parse(pieceOfCake);
                }



            }

            if (cakeSum > cakeArea)
            {
                Console.WriteLine($"No more cake left! You need {cakeSum - cakeArea} pieces more.");
            }
            else
            {
                Console.WriteLine($"{cakeArea - cakeSum} pieces are left.");
            }
        }
    }
}