In front of the West Lake Hotel, there is a pool 7m long, 4m wide, and 1m high. Uncle Zhang first filled the pool with water, and then put two stone pillars 2m long, 1.5m wide, and 2m high vertically into the pool. What is the volume of the overflowing water?
西湖饭店门前有一个长7m、宽4m、高1m的水池，张叔叔先在水池中注满水，然后把两条长2m、宽1.5m、高2m的石柱竖着放入池中，水池溢出水的体积是多少？
<gadget id="calculator">2 * 1.5 * 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>