The store shipped 1,800 kilograms of white sugar, sold 800 kilograms on the first day, and sold 600 kilograms on the second day, how many kilograms are left?
商店运来1800千克白糖，第一天卖出800千克，第二天卖出600千克，还剩多少千克？
<gadget id="calculator">800 + 600</gadget>
<output>1_400</output>

<gadget id="calculator">1_800 - 1_400</gadget>
<output>400</output>

<result>400</result>