The florist planted flowers around a square site, with 20 plants planted on each side, and one flower planted at each of the four vertices. How many flowers are planted around the site?
花工在一块正方形场地四周种花，每边都种20株，并且四个顶点都种有一株花，求这个场地四周共种了多少株花？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 - 4</gadget>
<output>76</output>

<result>76</result>