A swimming pool is 50 meters long, 30 meters wide, and 4 meters high. The floor and walls should be covered with tiles. How many square meters is the tiled area?
一个游泳池，长50米，宽30米，高4米，要用瓷砖来贴地面和四壁．贴瓷砖的面积是多少平方米？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">50 * 4 * 2</gadget>
<output>400</output>

<gadget id="calculator">30 * 4 * 2</gadget>
<output>240</output>

<gadget id="calculator">1_500 + 400 + 240</gadget>
<output>2_140</output>

<result>2_140</result>