A book has a total of 300 pages. How many types of typesetting workers in a printing factory need to use to arrange the book?
一本书共300页，印刷厂的排版工人编排这本书，仅排页码一共要用多少个铅字？
<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">201 * 3</gadget>
<output>603</output>

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

<result>792</result>