#include <iostream>

using namespace std;

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

int main()
{
	solve();
	return(0);
}