import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        List<Integer> list = new ArrayList<>();
        int ans = s;
        int m = 0;
        int n = 0;
        int cnt =1;

        list.add(s);

        while(true){
            if(ans%2==0){
                ans=ans/2;
            }else{
                ans=ans*3+1;
            }
            cnt++;

            if(list.contains(ans)){
               n = list.indexOf(ans);
               m = cnt;
               break;

            }else{
                list.add(ans);
            }

        }

        System.out.println(m);


    }
}

/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