
#include <iostream>

using namespace std;

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