A cuboid swimming pool is 50 meters long, 25 meters wide, and 3 meters deep. After pouring water into the pool for a while, Xiaohua saw that the water surface was still 0.5 meters away from the edge of the pool. At this time, how many cubic meters of water should be added to fill it up ?
长方体游泳池，长50米，宽25米，深3米，向池中放水一段时间后，小华一看，水面离池沿还有0.5米，这时，再放多少立方米水才能够放满？
<gadget id="calculator">50 * 25 * 0.5</gadget>
<output>625</output>

<result>625</result>