To number the pages of a book, a total of 723 numbers are used, so how many pages does this book have.
给一本书编页码，一共用了723个数字，那么，这本书有多少页．
<gadget id="calculator">11 + 181 + 300</gadget>
<output>492</output>

<gadget id="calculator">723 - 492</gadget>
<output>231</output>

<gadget id="calculator">231 / 3</gadget>
<output>77</output>

<gadget id="calculator">200 + 77</gadget>
<output>277</output>

<result>277</result>