#include <iostream>
using namespace std;

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

	return 0;
}