Passage: LetsRun Park Seoul, also known a Seoul Race Park or Seoul Racecourse Park is a 40,000 capacity Korean thoroughbred racetrack in Gwacheon, Gyeonggi-do, South Korea. It is host to many of Korea's most valuable thoroughbred horse races including the Korean Derby and Grand Prix. LetsRun Park Seoul is located next to Seoul Racecourse Park Station on Line 4 of the Seoul Metropolitan Subway. It is operated by the Korea Racing Authority (KRA).

Question: What is the capacity of the racetrack?
40,000