import java.util.*;
 
public class Main {
	public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
        int count = 1;
        if(n == 1 || n == 2){
        	System.out.println("4");
            return;
        }
        while(n != 4){
        	if(n % 2 == 0){
            	n = n / 2;
            }else{
            	n = n * 3 + 1;
            }
            count++;
        }
        System.out.println(count + 3);
    }
}
/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