Plant trees around a square pond, plant 10 trees on each side, and one tree is planted at each of the four corners. How many trees do you need to prepare?
在一个正方形池塘周围种树，每条边上种10棵，四个角都已种有一棵，需要准备多少棵树？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>