A swimming pool is 50 meters long, 20 meters wide, and 2.5 meters deep. How many square meters of tiles are needed to tile the sides and bottom of this swimming pool?
一个游泳池长50米，宽20米，深2.5米．要在这个游泳池的四周和底面贴上瓷砖，共需要多少平方米瓷砖？
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 2.5 * 2</gadget>
<output>250</output>

<gadget id="calculator">20 * 2.5 * 2</gadget>
<output>100</output>

<gadget id="calculator">1_000 + 250 + 100</gadget>
<output>1_350</output>

<result>1_350</result>