To place flower pots on the edge of a pentagonal pool, so that there are 6 pots on each side, at least how many potted flowers are needed.
要在一个五边形的水池边上摆花盆，使每边是6盆，至少需要多少盆花．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>