When the natural number A is divided by 25, the quotient is 40, and the remainder is C. To maximize the value of C, what should be the number of A.
自然数A除以25，商是40，余数为C，要使C值最大，A数应是多少．
<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">1_000 + 24</gadget>
<output>1_024</output>

<result>1_024</result>