#include <bits/stdc++.h>

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