Xiao Ming reads a story book. On the first day, he read 15 pages. From the second day on, he read 1 page more than the previous day. On the last day, he read 44 pages. How many pages does this book have?
小明读一本故事书，第一天读了15页，从第二天起，每天读的页数都比前一天多1页，最后一天读了44页，这本书共有多少页？
<gadget id="calculator">15 + 44</gadget>
<output>59</output>

<gadget id="calculator">44 - 15</gadget>
<output>29</output>

<gadget id="calculator">29 / 1</gadget>
<output>29</output>

<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">59 * 15</gadget>
<output>885</output>

<result>885</result>