import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int s = sc.nextInt();

        System.out.println(solve(s));

        sc.close();
    }

    static int solve(int s) {
        Set<Integer> seen = new HashSet<>();
        seen.add(s);
        int current = s;
        for (int m = 2;; ++m) {
            current = (current % 2 == 0) ? (current / 2) : (current * 3 + 1);
            if (seen.contains(current)) {
                return m;
            }

            seen.add(current);
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz