九度1031

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