import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int s=sc.nextInt();
		int[]a=new int [1000000];
		int Answer=0;
		a[0]=s;
		loop:for(int i=1;i<a.length;i++) {
			if(a[i-1]%2==0) {
				a[i]=a[i-1]/2;
			}
			else if(a[i-1]%2!=0) {
				a[i]=a[i-1]*3+1;
			}
			for(int j=0;j<i;j++) {
				if(a[i]==a[j]) {
					Answer=i;
					break loop;
				}
				
			}
		
		}
		System.out.println(Answer+1);
	
		sc.close();
	}

}
/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