n个人围成一个圈，每个人都按顺序编上号，从第一个人开始数起，数到3，则这个人出列，继续数到3，每数到3的这个人就出列，最后都只会剩下一个人，这个人是多少号？-n individuals in a circle, everyone is on the order code number, starting from the first few individuals, the count of 3, then this person out of the column, continue to count 3, count 3 for each man on the column, eventually leaving only one person, that person is number?