Place 5 pots of chrysanthemums equidistantly on each side of a square flower bed (all corners must be placed), how many pots of chrysanthemums are placed in total.
正方形花坛的每条边上等距离摆放5盆菊花(四角上都要摆放)，一共摆了多少盆菊花．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<result>16</result>