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

class Main {
	public static void main(String args[]) {
    	Scanner sc = new Scanner(System.in);;
            Map<Integer,Integer> table = new HashMap<Integer,Integer>();
            int n = sc.nextInt();
            int count = 1;
            while(!table.containsKey(n)) {
                table.put(n,count);
                count++;
                if( (n & 1) == 1) {
                    n = 3*n + 1;
                } else {
                    n = n >> 1;
                }
            }
            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