There were 865 tourists in the science and technology park in the morning, and 204 people left at noon. Another 313 tourists came in the afternoon. How many tourists are there in the park at this time?
科技园内上午有游客865人，中午有204人离开．下午又来了313位游客，这时园内有多少位游客？
<gadget id="calculator">865 - 204</gadget>
<output>661</output>

<gadget id="calculator">661 + 313</gadget>
<output>974</output>

<result>974</result>