import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int s = scan.nextInt();
        ArrayList<Integer> a = new ArrayList<>();
        a.add(s);
        int n = f(s);
        for(int i = 1; !a.contains(n); i++){
            a.add(n);
            n = f(n);
        }
        System.out.println(a.size() + 1);
        scan.close();
    }
    
    public static int f(int n){
        if(n % 2 == 0) return n / 2;
        return n * 3 + 1;
    }
}
/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