#include <iostream>
using namespace std;

int xxxlaw(int n) {
    int count = 0;
    while (1 != n) {
        if (0 == n % 2) {
            n = n / 2;
        } else {
            n = 3 * n + 1;
            n = n / 2;
        }
        count++;
    }
    return count;
}

int main() {
    int n;
    while (cin >> n) {
        cout << xxxlaw(n) << endl;
    }
    return 0;
}