import java.util.*;
import java.math.*;
import java.lang.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int s = sc.nextInt();

		if(s == 1){
			System.out.println(4);
		}else if(s ==2){
			System.out.println(4);
		}else
		{
			int count =1;
			do {
				if(s%2 ==0){
					s = s/2;
				}else{
					s = s*3 +1;
				}
			
				count++;
			} while (s!=1);
			System.out.println(count + 1);

		}

	}
}
/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