There were 935 tourists in the botanical garden in the morning, 357 people left at noon, and 397 people came in the afternoon. How many tourists are there in the garden at this time?
植物园上午有游客935人，中午有357人离去，下午又来了397人，这时园内有游客多少人？
<gadget id="calculator">935 - 357</gadget>
<output>578</output>

<gadget id="calculator">578 + 397</gadget>
<output>975</output>

<result>975</result>