#include <iostream>
using namespace std;

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