Embroider flowers on a square towel, with 1 flower on each of the 4 vertices and 6 flowers on each side. How many flowers are embroidered around this towel?
在正方形毛巾上绣花，4个顶点上各有1朵，每边都有6朵．这条毛巾四周一共绣了多少朵花．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

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

<result>20</result>