On October 1, there were 985 tourists in Xiyou Cave in the morning, 545 people left at noon, and 230 people came in the afternoon. How many tourists are there in Xiyou Cave at this time?
10月1日上午西游洞有游客985人，中午有545人离去，下午又来了230人，此时西游洞还有多少游客？
<gadget id="calculator">985 - 545</gadget>
<output>440</output>

<gadget id="calculator">440 + 230</gadget>
<output>670</output>

<result>670</result>