The fruit shop has shipped in 1 ton of watermelons and sold 800 kilograms. How many kilograms are left?
水果店运进1吨西瓜，已经卖出800千克，还剩多少千克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

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

<result>200</result>