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