There are 850 tons of rice in the grain store, 214 tons were sold in the first week, 386 tons were sold in the second week, all were sold out in the third week, how many tons were sold in the third week?
粮店有大米850吨，第一周卖了214吨，第二周卖了386吨，第三周全部卖完，第三周卖了多少吨？
<gadget id="calculator">850 - 214 - 386</gadget>
<output>250</output>

<result>250</result>