Xiaojie typed 135 words per minute. It took him 28 minutes to type an article, and he still had 650 words to type. How many words are there in this article?
小杰每分钟打135个字，他打一篇文章用了28分钟，还有650个字没有打完，这篇文章有多少个字？
<gadget id="calculator">135 * 28</gadget>
<output>3_780</output>

<gadget id="calculator">3_780 + 650</gadget>
<output>4_430</output>

<result>4_430</result>