All the even-numbered pages of a book use 397 numbers to write page numbers. How many numbers are used to write page numbers in this book?
一本书所有偶数页用了397个数字来编写页码，这本书用了多少个数字来编写页码呢？
<gadget id="calculator">201 * 3</gadget>
<output>603</output>

<gadget id="calculator">603 + 180 + 9</gadget>
<output>792</output>

<result>792</result>