A swimming pool is 50 meters long, 20 meters wide, and 2 meters deep. Now it is necessary to plaster the walls and bottom of the swimming pool. How many square meters is the area to be plastered?
一个游泳池，长50米，宽20米，深2米，现在要给游泳池的四壁和底面抹水泥，抹水泥的面积是多少平方米？
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">1_000 + 100 + 40</gadget>
<output>1_140</output>

<gadget id="calculator">1_140 * 2</gadget>
<output>2_280</output>

<gadget id="calculator">2_280 - 1_000</gadget>
<output>1_280</output>

<result>1_280</result>