#include<stdio.h>
int main()
{
int n,count;
while(scanf("%d",&n)!=EOF&&n!=0)
{
count=0;
while(n>1)
{
if(n%2==0) n/=2;
else n=(3*n+1)/2;
count++;
}
printf("%d\n",count);
}
return 0;
}
转载于:https://www.cnblogs.com/yyf573462811/archive/2012/10/14/6365219.html