Place potted flowers on the four sides of a square flower bed, place 6 pots on each side, and place 1 pot at each corner, how many potted flowers are needed in total.
在一个正方形花坛的四条边摆上盆花，每条边摆6盆，4个角都要摆1盆，共需多少盆花．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">24 - 4</gadget>
<output>20</output>

<result>20</result>