Definition: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: What is the age difference between the father and son who may have built Hauenštejn castle? Passage 1:In 1979 he moved to the Brabham team where he worked with the Brazilian driver Nelson Piquet and in 1981 moved to the German ATS team. Having decided not to set up his own team he then left motor racing to set up a self storage business. He has also competed in classic car rallies in cars including the Porsche 912 and won the Liège-Brescia-Liège rally for cars up to 700cc in a BMW 700. He was a technical advisor on the 2013 film Rush about the rivalry between the drivers James Hunt and Niki Lauda during the 1976 Formula One motor-racing season. In the film he was portrayed by Stephen Mangan and he also had a cameo role on screen as a race official.
 Passage 2:The castle was built in the 13th century by Přemysl Otakar II or his son Václav II to guard royal paths and local mines. The first known owner was Mikuláš Winkler, burgrave of Loket Castle, who sold Hauenštejn to the monastery in Doksany. The monastery exchanged it for another building with King John of Luxemburg. His son Charles IV enlarged the castle‘s domain. The castle frequently changed its keepers in the second half of the 14th century and the 15th century but it more or less remained royal property. The rich family of Šlik that started silver mining near Jáchymov won the castle in the 16th century. The Šliks rebuilt the castle in the Renaissance style after a fire in 1600. In 1663 the Šliks sold the castle to the Saxe-Lauenburg ducal family and it became part of the Ostrov domain. The castle was in the hands of the Baden family from 1689. When the last male member of the family died in 1771, the property of the Badens in Bohemia was inherited by the royal family of Maria Theresa. The Habsburgs sold it to the Buquoy family in 1837. Countess Gabrielle Buquoy started to rebuild the castle in a Romantic style. Ferdinand Buquoy continued the reconstruction under the influence of historism, taking its examples from England (Windsor, Arundel, Belvoir, Lancaster or Oxford) and Bavaria (Hohenswangau, Lahneck). 
 Passage 3:The 2010–11 offseason has been notable for the Orioles, featuring a complete makeover of their infield, with only Brian Roberts expected to reprise his starting role. On December 6, 2010, the Orioles completed a trade with the Arizona Diamondbacks for third basemen Mark Reynolds, in exchange for relief pitchers David Hernandez and Kam Mickolio. The next day, the Orioles lost corner infielder, second baseman (40 games in 2010), and lone 2010 All-Star representative Ty Wigginton when he signed with the Colorado Rockies. On December 9, however, a deal was struck with the Minnesota Twins, acquiring shortstop J. J. Hardy, utility infielder Brendan Harris and cash in exchange for minor league pitchers Jim Hoey and Brett Jacobson. The following day, the Orioles re-signed former starting shortstop César Izturis, though now as a utility middle infielder. Finally, after weeks of rumor and speculation, concerning possible first base signings, the Orioles inked veteran free agent Derrek Lee on January 6, 2011.

Output:
2