06. Cake

piece_of_cake = int(input()) * int(input())
hungry = 0
while piece_of_cake >= hungry:
    command = input()
    if command == "STOP":
        break
    hungry += int(command)

if piece_of_cake >= hungry:
    print(f'{piece_of_cake - hungry} pieces are left.')
else:
    print(f'No more cake left! You need {hungry - piece_of_cake} pieces more.')