Students participate in summer camp. There were 28 participants in the lower grades, and 16 people in the upper grades were 17 times more than the lower grades. If every 13 people share a tent. So how many tents do the students in the lower grades and senior grades need to set up?
同学们参加暑期夏令营．低年级有28人参加，高年级的人数比低年级的17倍还多16人．如果每13人合住一顶帐篷．那么低年级、高年级的同学们共需要架多少顶帐篷？
<gadget id="calculator">28 * 17</gadget>
<output>476</output>

<gadget id="calculator">476 + 16 + 28</gadget>
<output>520</output>

<gadget id="calculator">520 / 13</gadget>
<output>40</output>

<result>40</result>