#include <iostream>
using namespace std;
 
int main ()
{
	int N;
	while (1)
	{
		cin>>N;
		if (N==0) break;
		int count=1;
		while (N!=1)
		{
			if (N%2==0) N=N/2;
			else N=(N*3)+1;
			count++;
		}
		cout<<count<<endl;
	}
	return 0;
}