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# 3.有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），
# 凡报到3的人退出圈子，问最后留下的是原来第几号的那位。
list = [i for i in range(1,200)]
print(list)
while True:
list.pop(2)
before = list[:2]
list = list[2:]
list.extend(before)
if list.__len__()<=2:
break