The page number of a novel must be printed with 1989 typefaces. How many times does the number 1 appear in the page number of this book?
一本小说的页码，在印刷时必须用1989个铅字，在这一本书的页码中数字1出现多少次？
<gadget id="calculator">300 + 2_290</gadget>
<output>2_590</output>

<result>2_590</result>