17 students, 1 of them will be the referee, and they will be divided into 2 groups on average. How many people are in each group?
17个同学，1人当裁判，乘下的平均分成2组，每组几人？
<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>