A storybook has 10 pages, 22 lines per page, and 25 characters per line. How many characters are there in this storybook?
一本故事书共10页，每页22行，每行25个字，这本故事书一共有多少个字？
<gadget id="calculator">25 * 22 * 10</gadget>
<output>5_500</output>

<result>5_500</result>