#include <iostream>

using namespace std;

int main()
{
    int n;

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

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

    return 0;
}