text: length = int(input())
  width = int(input())
  
  cake_size = length * width
  is_over = False
  
  count = input()
  while not count == "STOP":
      count = int(count)
      cake_size -= count
  
      if cake_size <= 0:
          is_over = True
          print(f"No more cake left! You need {abs(cake_size)} pieces more.")
          break
      count = input()
  if not is_over:
      print(f"{cake_size} pieces are left.")
  
  