#include<iostream>
#include<math.h>
#include<vector>
#include<algorithm>
#include<cstdio>
#include <string>
using namespace std;

int main(){
    int n;
    while(cin>>n&&n){
        int count=0;
        while(n!=1){
            if(n%2==1){
                n=n*3+1;
            }else{
                n/=2;
            }
            count++;
        }
        cout<<count<<endl;
    }
    return 0;
}
