There are 8 people in the art group and 9 people in the music group in class 1 of the fourth grade, of which 3 people participated in both. How many people in class 4 actually participated in the activity.
四年级1班参加美术组的有8人，参加音乐组的有9人，其中两样都参加的有3人．四1班实际有多少人参加活动．
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<result>14</result>