A swimming pool is 30m long, 20m wide, and 2m deep. How many square tiles are needed to paste the four walls and the bottom with 5dm square tiles?
一个游泳池，长30m，宽20m，深2m，将四壁和底面用边长是5dm的正方形瓷砖贴上，需要多少块？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

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

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<gadget id="calculator">200 + 600</gadget>
<output>800</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<gadget id="calculator">800 * 4</gadget>
<output>3_200</output>

<result>3_200</result>