#include <iostream>
using namespace std;

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