#include<iostream>
#include<cstdio>

using namespace std;

int main(){
    int number=0;
    int n;
    while(scanf("%d",&n)!=EOF){
            if(n==0)
                break;
        while(n!=1){
            if(n%2==0)
                n=n/2;
            else {n=(3*n+1);n=n/2;}
            number++;
        }
    printf("%d\n",number); 
    number=0;   
    }

    return 0;
}