How many ebooks do you have? I have about 1400 currently, mostly math books, computer science books, papers. It's nice to organise that a little bit more detail

How many ebooks do you have? I have about 1400 currently, mostly math books, computer science books, papers. It's nice to organise that a little bit more detailed than the file system does. It is my MAIN library, I have just 20 or 30 physical books that I bought because I couldn't get them in digital form. Calibre is not optimal, but I am glad it exists.