The City Children's Palace held a roller skating competition. The boys were divided into 16 groups, and the girls were divided into 12 groups. Each group had 15 players. How many people participated in the competition?
市少年宫举行滑旱冰比赛，男生分成了16组，女生分成了12组，每个组都有15名队员．参加比赛的一共有多少人？
<gadget id="calculator">16 + 12</gadget>
<output>28</output>

<gadget id="calculator">28 * 15</gadget>
<output>420</output>

<result>420</result>