using System;

class MainClass {
  public static void Main (string[] args)
  {
      int width = int.Parse(Console.ReadLine());
      int hight = int.Parse(Console.ReadLine());
      int piceOfCake = 0;

      int cakeDimension = width * hight;

      while (true)
      {
        string input = Console.ReadLine();
        if (input == "STOP")
        {
          break;
        }
        else
        {
            piceOfCake = int.Parse(input);
            cakeDimension -= piceOfCake;
            if(cakeDimension <= 0)
            {
              break;
            }
        }
      }

      if (cakeDimension <= 0)
      {
        Console.WriteLine("No more cake left! You need " + Math.Abs(cakeDimension)+ " pieces more.");
      }
      else
      {
        Console.WriteLine(cakeDimension + " pieces are left.");
      }

  }
}