Please answer a question about the following article about 2008 Summer Olympics torch relay:


 Russia: On April 5 the Olympic torch arrived at Saint Petersburg, Russia. The length of the torch relay route in the city was 20 km, with the start at the Victory Square and finish at the Palace Square. Mixed martial arts icon and former PRIDE Heavyweight Champion Fedor Emelianenko was one the torch bearers. This gives him the distinction of the being the first active MMA fighter to carry the Olympic flame.

When did the torch arrive in Saint Petersburg?
April 5