using System;

public class Program

{

    public static void Main()

    {

        var weight = int.Parse(Console.ReadLine());

        var lenght = int.Parse(Console.ReadLine());

        long cakeSize = weight * lenght;

        bool finished = true;

        while (true)

        {

            string current = Console.ReadLine();

            if (current == "STOP")

            {

                break;

            }

​

            cakeSize -= int.Parse(current);

            if (cakeSize < 0)

            {

                finished = false;

                break;

            }

        }

​

        if (finished == false)

        {

            Console.WriteLine("No more cake left! You need {0} pieces more.", Math.Abs(cakeSize));

        }

        else

        {

            Console.WriteLine("{0} pieces are left.", cakeSize);

    }

}