#include<iostream>
#include<cstdio>
using namespace std;

int main(){
  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;

  }




}