If A, B, C, and D have an average of more than 40 books, what is the maximum number of books they can have?
甲、乙、丙、丁四个人平均有40多本图书，则他们的图书总数最多可以是多少本．
<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<gadget id="calculator">200 - 1</gadget>
<output>199</output>

<result>199</result>