using System;

public class Program

{

    public static void Main()

    {

        var shiro4ina=int.Parse(Console.ReadLine());

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

        int pieces=shiro4ina*daljina;

        int pieces_left=pieces;

        //int par4e=0;

        bool fin=true;

        do

        {

            string niz=Console.ReadLine();

            if(niz=="STOP") break;

            //bool parseSuccess = Int32.TryParse(niz, out par4e);

            pieces_left=pieces_left-int.Parse(niz);

            if (pieces_left<0)

            { fin=false;break;}

            //if(parseSuccess==false) 

        }

        while(true);

        if (fin==false) Console.WriteLine("No more cake left! You need {0} pieces more.",Math.Abs(pieces_left));

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

    }

}