The page number of a novel must use 2511 numbers when typesetting. How many pages does this book have?
一本小说的页码在排版时必须用2511个数码，问这本书共有多少页？
<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">2_511 - 9 - 180</gadget>
<output>2_322</output>

<gadget id="calculator">2_322 / 3</gadget>
<output>774</output>

<gadget id="calculator">774 + 90 + 9</gadget>
<output>873</output>

<result>873</result>