There is a manuscript paper with 40 pages in total, 20 lines per page, and 13 grids per line. How many words can this manuscript paper write at most?
有一本稿纸，共40页，每页20行，每行13个格．这本稿纸最多能写多少个字？
<gadget id="calculator">13 * 20 * 40</gadget>
<output>10_400</output>

<result>10_400</result>