#include <iostream>
using namespace std;

int main() {
    int n,res = 0;
    while(cin >> n)
    {
        while(n != 1)
        {
            if(n % 2 == 0)
            {
                n = n / 2;
                res++;
            }
            else 
            {
                n = (3 * n + 1) / 2;
                res++;
            }
        }
        cout << res << endl;
    }
    return 0;
}
// 64 位输出请用 printf("%lld")