There are 50 pages in a comic book, and one typeface can only place one number when typesetting. Please calculate how many typefaces are used to arrange the page numbers of this book.
一本小人书共50页，排版时一个铅字只能排一位数字，请你算一下，排这本书的页码共用了多少个铅字．
<gadget id="calculator">41 * 2</gadget>
<output>82</output>

<gadget id="calculator">9 + 82</gadget>
<output>91</output>

<result>91</result>