Put flowerpots on the edge of a pentagonal pool, there are 10 potted flowers on each side, how many potted flowers are needed at least.
在一个五边形的水池边上摆上花盆，每一边上都有10盆花，最少需要多少盆花．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>