class Archive {
    protected int id;
    protected Date dateArchived;

    public Archive(int id) {
        this.id = id;
        this.dateArchived = new Date();
    }

    public Date getDate() {
        return dateArchived;
    }
}
class LockedArchive extends Archive {
    protected Date dateToOpen;

    public LockedArchive(int id, Date dateToOpen) {
        super(id);
        this.dateToOpen = dateToOpen;
    }

    public Date getDate() {
        return dateToOpen;
    }

}
class SpecialArchive extends Archive {
     protected int maxOpen;
     protected int timesOpen;

     public SpecialArchive(int id, int maxOpen) {
             super(id);
             this.maxOpen = maxOpen;
             timesOpen = 0;
     }
}
class ArchiveStore {
    ArrayList<Archive> files;
    StringBuilder logFile;

    public ArchiveStore() {
        files = new ArrayList<Archive>();
        logFile = new StringBuilder();
    }

    public void archiveItem(Archive item, Date date) {
        files.add(item);
        logFile.append("Item " + item.id + " archived at " + date + "\n");

    }

    public void openItem(int id, Date date) throws NonExistingItemException {
        boolean isOpen = false;
        Archive itemToArchive = null;
        for (Archive itemFromArchive : files) {
            if (itemFromArchive.id == id) {
                isOpen = true;
                itemToArchive = itemFromArchive;
                break;
            }
        }
        if (isOpen == true) {
            if (itemToArchive instanceof LockedArchive) {
                if (itemToArchive.getDate().getTime() > date.getTime()) {
                    logFile.append("Item " + id + " cannot be opened before " + itemToArchive.getDate() + "\n");
                } else {
                    logFile.append("Item " + id + " opened at " + date + "\n");
                }
            } else {
                if (itemToArchive instanceof SpecialArchive) {
                    SpecialArchive o = null;
                    o = (SpecialArchive) itemToArchive;
                    if (o.maxOpen <= o.timesOpen) {
                        logFile.append("Item " + id + " cannot be opened more than " + o.maxOpen + " times\n");
                    } else {
                        logFile.append("Item " + id + " opened at " + date + "\n");
                        o.timesOpen++;
                    }
                } else {
                    logFile.append("Item " + id + " opened at " + date + ",\n");
                }

            }
        } else {
            throw new NonExistingItemException("Item with id " + id + " doesn't exist");
        }

    }

    public String getLog() {
        return logFile.toString();
    }
}

@SuppressWarnings("serial")
class NonExistingItemException extends Exception {
    public NonExistingItemException(String s){
        super(s);
    }
}