#include <iostream>

using namespace std;

int main()
{
	int n;
	
	while (cin >> n, n){
		int count = 0;
		while (n != 1){
			if (n % 2 == 0){
				n /= 2;
			}
			else {
				n = n * 3 + 1;
			}
			count++;
		}
		cout << count << endl;
	}
	return (0);
}