*Cake* 6/10

width =int(input())
length = int(input())
cake_size = width * length

while cake_size > 0:
    current_pices_of_cake = input()

    if current_pices_of_cake == 'STOP':
        break

    cake_size -= int(current_pices_of_cake)

if cake_size > 0:
    print(f'{cake_size} pieces are left.')

else:
    print(f'No more cake left! You need {abs(cake_size)} pieces more.')