The 23 bookshelves in the school library are full of books. Each shelf has 4 floors, and each floor contains about 35 books. How many books are there in the school library?
学校图书馆里23个书架上都摆满了书，每个书架4层，每层大约放了35本书，学校图书馆大约有多少本书？
<gadget id="calculator">35 * 4 * 23</gadget>
<output>3_220</output>

<result>3_220</result>