import java.util.*;

public class Main{
    public static void main(String[]args){
        Scanner sc=new Scanner(System.in);
        int s=sc.nextInt(); //初項
        int f[]=new int[1000001];
        System.out.println(cal(s,f,0));
        
    }
    public static int cal(int s,int[]f,int count){
        f[s]++;
        count++;
        if(f[s]>=2) return count;
        if(s%2==0) s/=2;
        else s=s*3+1;
        return cal(s,f,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