"""

21跟火柴

"""

from random import randint

def main():

    total=21

    while total>0:

        print('剩余%d跟火柴'% total)

        while True:

            num=int(input('你拿几根火柴：'))

            if 1<=num<=4 and num<=total:

                break

        total-=num

        if total>0:

            com=randint(1,min(4,total))

            print('计算机拿走了%d跟火柴' % com)

            total-=com

            if total==0:

                 print('计算机拿走了最后一根火柴你输了！')

        else:

            print('你拿走了最后一根火柴你输了！')

if __name__ == '__main__':

    main()