#include<iostream>
using namespace std;
int main()
{
  long int n;
  for(;cin>>n,n;)
    {
      int i=0;
      for(;n!=1;)
      {
	if(n%2==0)
	  n/=2;
	else
	  n=n*3+1;
	i++;
      }
      cout<<i<<endl;
    }
}