1000 librarians

In general, I wanted to create a librarian with a book of fixing, and for this I will replacing  the block of his profession, but in the process he left a library, and I followed him with this block when I put it on the market square in the village, and again broke it and again put it, there were already 2 librarians, I broke it and put it in again, there were 3 of them, so when I will remove this block they didn't quit the job, and after putting it in, an unemployed villager became a librarian, and there were more and more of them