#include <iostream>

using namespace std;

int main(void)
{
	int n;
	int answer;

	while( cin >> n && n != 0 ){
		answer = 0;

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