What does 5+500 mean?

Detention for five days. A fine of 500.

On the afternoon of August 8, a post of "Children in Coffins" appeared on the Internet, saying that someone in a town in Yangchun used coffins to hold abducted children, and one of them died. Yangchun police immediately organized to check the police situation. After investigation, no relevant alarm was found. In order to find out the truth, the police summoned Lin, the initiator of the forum post, for questioning. It is understood that Lin (male, 35 years old, from Jiangmen) is a supervisor of a company in yangchun city. Through hearsay, without any basis, he used the computer in the company office to post a post entitled "Children in Coffins" in the "Yangchun Big Talk" section of Yangchun YCQQ Forum. The police said that Lin fabricated facts and made up sensational events to be published online, disturbing public order and causing panic. In accordance with relevant laws, he was administratively detained for five days and fined 500 yuan. Lin regrets his behavior.