几个同学围成一圈报数，报到3的出局，问最后一个出局的是哪位-Several students reported that the number circle, report 3 out, ask which is the last one out

输出乘法口诀 输入一个整数倒序输出 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），凡报到3出局，问最后剩下的一人为几号。(N personal circle, order arranging, started from the first report (from 1 to 3), who reported 3 outs, asked the last few people)