Among a group of children, 10 people have watched the cartoon "Black Cat Sheriff", 20 people have watched the cartoon "Havoc in Heaven", and 6 people have watched both cartoons. May I ask: at least one of them has been watched How many children are there in a movie?
在一群小朋友中，有10人看过动画片《黑猫警长》，有20人看过动画片《大闹天宫》，并且有6人两部动画片都看过，请问：至少看过其中一部的小朋友有多少人？
<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<gadget id="calculator">10 + 14</gadget>
<output>24</output>

<result>24</result>