while True:
    number = input('Введите число: ')
    if number=="Стоп":
        break
    if '0' in number:
        count = 0
        for i in number:
                count += int(i)
        print(count)
        continue
    else:
        count = 1
        for i in number:
                count *= int(i)
        print(count)
        continue