If 800 kg of fruit is shipped to the market, how many kg should be shipped is exactly 1 ton.
市场上运来水果800千克，还要运多少千克正好是1吨．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<result>200</result>