10.06. Cake

width = int(input())
length = int(input())
cake = width * length
all = 0
stopped = False
while all < cake:
    pieces = input()
    if pieces == 'STOP':
        stopped = True
        break
    piece = int(pieces)
    all += piece
if stopped:
     print(f"{cake-all} pieces are left.")
if all>cake:
    print(f"No more cake left! You need {all-cake} pieces more.")