using System;

    class Program
    {
        static void Main(string[] args)
        {

        int width = int.Parse(Console.ReadLine());
        int length = int.Parse(Console.ReadLine());
        string command = Console.ReadLine();
        int pieces = 0;
        int piecesInCake = width * length;

        while(command != "STOP")
        {
            pieces = int.Parse(command);

            if (piecesInCake > pieces)
            {
                piecesInCake -= pieces;
            }
            else
            {
                piecesInCake = Math.Abs(piecesInCake - pieces);
                Console.WriteLine($"No more cake left! You need {piecesInCake} pieces more.");
                break;
            }

            command = Console.ReadLine();
        }

        if(command == "STOP")
        {
            Console.WriteLine($"{piecesInCake} pieces are left.");
        }


    }
    }