using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace P04_Cake
{
    class Program
    {
        static void Main(string[] args)
        {
            double lenght = double.Parse(Console.ReadLine());
            double width = double.Parse(Console.ReadLine());

            double cake = lenght * width;
            double needed = 0;



            while (true)
            {

                string current = Console.ReadLine();
                if (current == "STOP")
                {
                    Environment.Exit(0);
                }
                double pieces = double.Parse(Console.ReadLine());
                if (cake >= pieces)
                {
                    cake -= pieces;
                    if (cake == 0)
                    {
                        Console.WriteLine(cake);
                        Environment.Exit(0);
                    }

                }
                if (pieces > cake)
                {
                    needed = pieces - cake;
                    break;
                }

            }
            Console.WriteLine($"No more cake left! You need {needed} pieces more.");



        }
    }
}