using System;

namespace Cake
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int pieces = a * b;

            for (int i = 0; i < pieces; i++)
            {
                int num = int.Parse(Console.ReadLine());
                pieces -= num;
            }

            string pieces2 = pieces.ToString();
            var stop = Console.ReadLine().ToLower();
            // i s dvata varianta ne stava
            if (pieces2 == "stop")
            { Console.WriteLine("{0} pieces are left.", pieces); }
            else if (pieces < 0)
            { Console.WriteLine($"No more cake left! You need {Math.Abs(pieces)} pieces more."); }
        }
    }
}