#include<iostream>
#include<cmath>
#define loop(i,a,b) for(int i=;i<b;i++)
#define rep(i,a) loop(i,0,a)
using namespace std;

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