import java.util.*;

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

        int s = sc.nextInt();
        Map<Integer,Integer> list = new HashMap<Integer,Integer>();
        int n = 1;
        while(true){
            list.put(s, s);
            n++;
            if(s % 2 == 0){
                s /= 2;
            }else{
                s = s * 3 + 1;
            }
            if(list.containsKey(s)){
                System.out.println(n);
                break;
            }
        }
    }
}

/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