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[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
}

/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