#include<iostream>
#include<cstdio>
using namespace std;
int main(void){
    int n,count,i,j,ans;
    while(1){
        count=0;
        cin >> n;
        if(n == 0)break;
        while(n != 1){
            if(n%2 == 0){
                n=n/2;
                count++;
            }
            else{
                n=(n*3)+1;
                count++;
            }
        }
        cout << count << endl;
    }
}
