542 people visited the Children's Paradise in the morning, and 248 people left at noon. Another 306 people came in the afternoon. How many tourists are there in the children's playground?
儿童乐园上午来了542人游玩，中午有248人离去．下午又来了306人，这时儿童乐园内有多少游客？
<gadget id="calculator">542 - 248</gadget>
<output>294</output>

<gadget id="calculator">294 + 306</gadget>
<output>600</output>

<result>600</result>