import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        if(s == 1) {
            System.out.println(4);
            return;
        }
        if(s == 2) {
            System.out.println(4);
            return;
        }
        int ans = 1;
        while(true) {
            if(s == 1) {
                ans++;
                break;
            }
            if(s % 2 == 0) {
                s /= 2;
            } else {
                s = s * 3 + 1;
            }
            ans++;
        }
        System.out.println(ans);
    }
}
/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