There were 568 tourists in the science and technology park in the morning, 198 people left at noon, and 172 tourists came in the afternoon. How many tourists came to the park all day.
科技园上午游客568人，中午有198人离去，下午又来了172位游客，全天园内共来了多少位游客．
<gadget id="calculator">568 + 172</gadget>
<output>740</output>

<result>740</result>