The seventh volume of mathematics textbooks has 173 pages in total. How many numbers are used for the page numbers of this book?
第七册数学书课本共有173页，编印这本书的页码共要用多少个数字？
<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">74 * 3</gadget>
<output>222</output>

<gadget id="calculator">9 + 180 + 222</gadget>
<output>411</output>

<result>411</result>