A square flower bed is placed in front of the school building. There are 9 pots of flowers on each side of the outermost layer of the flower bed, and how many pots are placed on the outermost layer.
学校楼前摆放了一个方阵花坛，这个花坛最外层每边各摆9盆花，最外层摆了多少盆．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 - 4</gadget>
<output>32</output>

<result>32</result>