It is necessary to place flowerpots on the edge of the square fountain, and place 7 potted flowers on each side (there must be one potted flower on each of the four corners), how many potted flowers should be placed in total?
要在正方形的喷水池边上摆上花盆，每一边摆放7盆花(四个角上都要有一盆花)，一共要摆多少盆花？
<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<result>24</result>