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# -*- coding:utf-8 -*-

__author__ = 'gjw'

__time__ = '2018/1/10 0010 下午 4:02'

# 题目：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。

if __name__ == '__main__':

nmax = 50

n = int(input('请输入总人数:'))

num = []

for i in range(n):

num.append(i + 1)

i = 0

k = 0

m = 0

while m < n - 1:

if num[i] != 0: k += 1

if k == 3:

num[i] = 0

k = 0

m += 1

i += 1

if i == n: i = 0

i = 0

while num[i] == 0: i += 1

print(num[i])