human
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
In a library, Jane, Kevin, and Laura are studying together. Jane brings six books on history, Kevin brings four books on science, and Laura brings three books on art. During their study session, the librarian removes two history books and one science book from their table because they were reserved by another student. Later, an unknown student adds two philosophy books to their collection. When they finish studying, how many books do Jane, Kevin, and Laura think they need to return to the shelves? Provide a very brief response.

### Response:
gpt
Jane, Kevin, and Laura originally have a total of 13 books (6 history + 4 science + 3 art). The librarian takes away 3 books (2 history + 1 science), leaving them with 10 books. An unknown student then adds 2 philosophy books, bringing the total to 12 books. Therefore, when they finish studying, Jane, Kevin, and Laura think they need to return 12 books to the shelves.