There were 527 tourists in the amusement park in the morning, 368 people left at noon, and 409 people came in the afternoon. How many tourists are there in the amusement park now?
游乐园上午有游客527人，中午有368人离去，下午又来了409人，游乐园现在有游客多少人？
<gadget id="calculator">527 - 368</gadget>
<output>159</output>

<gadget id="calculator">159 + 409</gadget>
<output>568</output>

<result>568</result>