How many ...? — 英语阅读题

阅读短文，回答问题。 Tom is tidying his desk at home. He puts his things in the box. Look! There are six rulers in the box. Tom counts his books: one, two, three, four — four books. His sister Lily comes. She has five pencils and gives them to Tom. Now Tom puts the five pencils in the box too. Tom is happy. He says, "Now I have many things in my box!" Question: How many pencils does Lily give to Tom? Please write your answer in English.