import java.util.*;

public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        Set<Integer> s = new HashSet<>();
        s.add(a);
        int idx = 1;
        while(true) {
            idx++;
            int t = a % 2 == 0 ? (a / 2) : (3 * a + 1);
            if(s.contains(t)) {
                System.out.println(idx);
                break;
            } 
            s.add(t);
            a = t;
        }
    }
}


/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