日本数学家角夫提出了如下的猜想： 任意一个自然数，比如奇数，将其乘以3再加1；如果是偶数将其除以2；反复运算。请大家编写程序，看会出现什么结果？

编写程序功能要求能够不停的输入自然数，遇到输入自然数0时，程序结束。

-Japanese mathematician angle Mufti following conjecture: any natural number, such as an odd number, multiplied by 3 plus 1　if it is an even number is divided by 2　repeatedly computing. Please write a program to see what would happen? Programming functional requirements to be able to stop the input of natural numbers encountered in the input of natural numbers 0, the end of the process.