// 2011/01/17 Tazoe

#include <iostream>
using namespace std;

int main()
{
	while(true){
		int n;
		cin >> n;
		if(n==0)
			break;

		int cnt = 0;

		while(n!=1){
			if(n%2==0)
				n /= 2;
			else
				n = 3*n+1;
			cnt++;
		}

		cout << cnt << endl;
	}

	return 0;
}