#include <iostream>
using namespace std;

int main(void)
{
	int n;

	while(cin >> n, n){
		int c = 0;

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

	return 0;
}