import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        Integer x = sc.nextInt();
        Set<Integer> st = new HashSet<Integer>();
        int count = 1;
         
        while(!st.contains(x)){
            st.add(x);
            if(x % 2 == 0){
                x = x/2;
            }else if(x % 2 == 1){
                x = 3 * x + 1;
            }
            count++;
        }     
        System.out.println(count);
    }
}
/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