import java.util.*;

public class Main {
    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int ans = 1;
        int MAXN = (int)1e6;
        boolean[] present = new boolean[MAXN];
        while (true) {
            if (present[n]) {
                break;
            }
            present[n] = true;
            if ((n & 1) == 1) n = 3 * n + 1;
            else n /= 2;
            ans += 1;
        }
        System.out.println(ans);
        sc.close();
    }
}
/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