There are some children standing around the square stage, one person stands on each of the four vertices, and seven people stand on each side. How many children are standing around the stage?
在正方形舞台四周站着一些小朋友，4个顶点都站有1人，每边上都站了7人．这个舞台的四周共站了多少个小朋友？
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>