#include <iostream>
using namespace std;

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