A cuboid swimming pool is 50 meters long, 40 meters wide, and 1.8 meters deep. The four walls are made of marble with a side length of 0.5 meters. How many pieces of marble are needed?
一个长方体游泳池，长50米，宽40米，深1.8米，四壁用每块边长0.5米的大理石砌成，需要大理石多少块？
<gadget id="calculator">50 * 1.8 * 2</gadget>
<output>180</output>

<gadget id="calculator">40 * 1.8 * 2</gadget>
<output>144</output>

<gadget id="calculator">180 + 144</gadget>
<output>324</output>

<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">324 / 0.25</gadget>
<output>1_296</output>

<result>1_296</result>