If the school wants to beautify the campus, it needs to place flowers around the square pool, with one pot on each of the four corners, and 5 pots on each side, so how many potted flowers should be prepared in total.
学校要美化校园，要在正方形水池四周摆花，四个角都摆一盆，每边都摆5盆，那么一共要准备多少盆花．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>