Mingming copied a copybook to practice brush calligraphy. When copying the first time, he wrote 25 characters a day. When copying the second time, he wrote 3 more characters a day. The result was just 3 days less than the first time. How many characters are there in this copybook?
明明临摹一本字帖练习毛笔字，临摹第一遍时，他每天写25个字，临摹第二遍时，他每天多写3个字，结果刚好比第一遍少用了3天，则这本字帖共有多少字．
<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">75 + 9</gadget>
<output>84</output>

<gadget id="calculator">3 - 25</gadget>
<output>-22</output>

<gadget id="calculator">25 + (-22)</gadget>
<output>3</output>

<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 * 25</gadget>
<output>700</output>

<result>700</result>