#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    int n;
    int k=0;
    while(scanf("%d",&n)!=EOF)
    {
        if(n==0)
        {
            break;
        }
        while(n!=1)//先判断等不等于1//这儿挺烦的
        {
            if(n%2==0)
            {
                n=n/2;
            }
            else
            {
                n=3*n+1;
                n=n/2;
            }
            ++k;//每循环一次,k++
        }
        printf("%d\n",k);
    }
}