A fish tank is 50 cm long, 25 cm wide, and 35 cm high from the inside. Beibei pours 37 liters of water into the tank and puts a goldfish in. At this time, the water surface is 5 cm away from the mouth of the tank. How big is it?
一个鱼缸从里面，长50厘米，宽25厘米，高35厘米，贝贝向鱼缸中倒入37升水，又放入了一条金鱼，此时，水面距缸口还有5厘米，这条金鱼的体积有多大？
<gadget id="calculator">35 - 5</gadget>
<output>30</output>

<gadget id="calculator">50 * 25 * 30</gadget>
<output>37_500</output>

<gadget id="calculator">37 * 1_000</gadget>
<output>37_000</output>

<gadget id="calculator">37_500 - 37_000</gadget>
<output>500</output>

<result>500</result>