06. Cake

size1 = int(input())
size2 = int(input())
cake_size = size1 * size2
pieces = ""

while cake_size > 0:
    pieces = input()
    if pieces != "STOP":
        pieces = int(pieces)
    else:
        break
    cake_size -= pieces
if pieces == "STOP":
    print(f"{cake_size} pieces are left.")
else:
    print(f"No more cake left! You need {abs(cake_size)} pieces more.")