#include <bits/stdc++.h>

using namespace std;

int main(void) {
	long n;
	int cnt;

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

	return 0;
}
