The grain store shipped 1 ton of rice and sold 340 kilograms. How many kilograms are left over?
粮店运来1吨大米，已经卖出340千克，剩下的比卖出的多多少千克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 340 - 340</gadget>
<output>320</output>

<result>320</result>