using System;

namespace _06Cake
{
    class Cake
    {
        static void Main(string[] args)
        {

            double cakeWidth = double.Parse(Console.ReadLine());
            double cakeLength = double.Parse(Console.ReadLine());
            string command = Console.ReadLine();
            command = command.ToUpper();

            double cakePieces = (cakeWidth * cakeLength);
            int eatenPieces = 0;

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

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

                command = Console.ReadLine();

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