// 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 = n/2;
			}
			else{
				n = n*3+1;
			}

			cnt++;
		}

		cout << cnt << endl;
	}

	return 0;
}