Directions to LRI From the Orsay-Ville train station, take the pedestrian underpath to the left, at the end of the train platform. Follow the signs indicationg "FAC" ("faculty" or university campus). Take rue Elisa-Desjobert straight ahead. You will pass a parking lot on your right, a gas station on your left, and cross over small bridge which leads straight to the university's main entrance gate. Stay on the sidewalk on the right side of the street, and go up the steps of the path that takes you past two buildings on your right. The path turns into a paved stairway, which separates into two main branches. Keep on the right. The stairway open out onto a parking lot right in front of building number 490. The Algorithms and Complexity group is on the third floor (2 flights up from the ground floor.) There is a telephone in the hall to the left of the stairs where you can call your host by dialing the last 5 digits of their number.