There are 20 little birds on the tree, 3 of them flew away in the first time, and 5 flew away in the second time, how many birds flew away in total.
树上有20只小鸟，第一次飞走3只，第二次又飞走了5只，一共飞走了多少只小鸟．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<result>8</result>