using System;

namespace ConsoleApp21
{
    class Program
    {
        static void Main(string[] args)
        {
            int wight = int.Parse(Console.ReadLine());
            int light = int.Parse(Console.ReadLine());
            int wholeCake = light * wight;
            string comand = Console.ReadLine();
            int counterCake = 0;
            while (comand != "Stop")
            {
                int picesCake = int.Parse(comand);
                counterCake += picesCake;
                if (wholeCake <= counterCake)
                {
                    Console.WriteLine($"No more cake left! You need {counterCake - wholeCake} pieces more");

                }
                comand = Console.ReadLine();
            }
            Console.WriteLine($"{wholeCake - counterCake} pieces are left.");

        }
    }
}