#include <iostream>
#include <string>
#include <vector>
using namespace std;

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