A car is limited to 2 tons, and now 1,500 kilograms of goods have been loaded, how many kilograms can be loaded?
一辆汽车限载2吨，现在已经装了1500千克的货物，还可以再装多少千克？
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 1_500</gadget>
<output>500</output>

<result>500</result>