The fifth grade students play games, if there are 5 people in a group, there are 2 more people, and if 3 people are in a group, there are 2 more people. At least how many people in the fifth grade play games?
五年级同学做游戏，如果5人一组，多2人，如果3人一组也多2人．五年级最少有多少人做游戏？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<result>18</result>