If there are 10 potted flowers on each side of a square flower bed, how many potted flowers are placed around the flower bed? (each vertex has 1 pot)
一个正方形花坛，每条边上都摆10盆花，那么这个花坛周围共放了多少盆花．(每个顶点各有1盆)
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<result>36</result>