import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int cur = sc.nextInt();
		int ans = 0;
		boolean used[] = new boolean[1000000 + 1];

		while(true) {
			ans += 1;
			if(used[cur]) {
				System.out.println(ans);
				return;
			} else {
				used[cur] = true;
				cur = cur % 2 == 0 ? cur / 2 : 3 * cur + 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