13 children played the game of "Eagle Catch Chickens", and they have already caught 5 "chickens", how many of them have not been caught?
13个小朋友玩"老鹰抓小鸡"的游戏，已经抓住了5只"小鸡"，还有几只没抓住？
<gadget id="calculator">13 - 1 - 5</gadget>
<output>7</output>

<result>7</result>