Question: How many seat does the indoor sports arena where "2010 European Taekwondo Championships" housed? 
Sentence (from "Yubileyny Sports Palace"): Yubileyny Sports Palace (Russian: Спортивный комплекс "Юбилейный ), "Sportivniy kompleks Yubileyniy"; also translated as Yubileiny (Jubilee) Palace of Sports, is an indoor sports arena and concert complex that is located in St. Petersburg, Russia.
Relevant evidence: No