06. Cake

# 06. Cake
cake_width = int(input())
cake_length = int(input())
first_piece = input()
cake_size = cake_width * cake_length
pieces_sum = 0
while first_piece != "STOP":
    next_piece = int(first_piece)
    if pieces_sum + next_piece > cake_size:
        pieces_sum += next_piece
        break
    else:
        pieces_sum += next_piece
        first_piece = input()
if cake_size >= pieces_sum:
    print(f"{cake_size - pieces_sum} pieces are left.")
else:
    print(f"No more cake left! You need {pieces_sum - cake_size} pieces more.")