There is a pentagonal ornament with 7 diamonds inlaid on each side including the apex. How many diamonds are there around this ornament?
有一个五边形的饰品，每边包括顶点在内共镶嵌7颗钻石，这件饰品的周围共有几颗钻石？
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">35 - 5</gadget>
<output>30</output>

<result>30</result>