Kunming Botanical Garden had 597 tourists in the morning, 209 at noon, and 420 in the afternoon. How many tourists are there in the botanical garden now?
昆明植物园上午来了游客597人，中午走了209人，下午又来了420人，现在植物园有游客多少人？
<gadget id="calculator">597 - 209</gadget>
<output>388</output>

<gadget id="calculator">388 + 420</gadget>
<output>808</output>

<result>808</result>