import java.io.*;
import java.util.*;

class Program{

}
class Main{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int count = 1,N = in.nextInt();
        Set<Integer> S = new HashSet<Integer>();
        S.add(N);
        while(true){
            if(N%2==0){
                N/=2;
            }
            else{
                N = 3*N+1;
            }
            S.add(N);
            count++;
            if(S.size()<count) {
                System.out.println(count);
                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