On October 1st, there were 853 tourists in China's Dead Sea in the morning, 422 people left at noon, and 355 people came in the afternoon. How many tourists were there in China's Dead Sea at this time?
10月1日上午中国死海有游客853人，中午有422人离去，下午又来了355人，这时中国死海有游客多少人？
<gadget id="calculator">853 - 422</gadget>
<output>431</output>

<gadget id="calculator">431 + 355</gadget>
<output>786</output>

<result>786</result>