To number the pages of a book, how many numbers are used from page 1 to page 119?
给一本书编页码，从第1页到第119页，一共用多少个数字．
<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">119 - 100</gadget>
<output>19</output>

<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">9 + 180 + 60</gadget>
<output>249</output>

<result>249</result>