Input: Article: In September 1828 Chopin, while still a student, visited Berlin with a family friend, zoologist Feliks Jarocki, enjoying operas directed by Gaspare Spontini and attending concerts by Carl Friedrich Zelter, Felix Mendelssohn and other celebrities. On an 1829 return trip to Berlin, he was a guest of Prince Antoni Radziwiłł, governor of the Grand Duchy of Posen—himself an accomplished composer and aspiring cellist. For the prince and his pianist daughter Wanda, he composed his Introduction and Polonaise brillante in C major for cello and piano, Op. 3.

Now answer this question: Who did Frédéric visit Berlin with in September 1828?

Output: Feliks Jarocki

Input: Article: In 2014, the league announced the granting of a new franchise to former Mötley Crüe frontman Vince Neil, previously part-owner of the Jacksonville Sharks. That franchise, the Las Vegas Outlaws, were originally to play in Las Vegas at the MGM Grand Garden Arena in 2015, but instead played their home games at the Thomas & Mack Center, previous home to the Las Vegas Sting and Las Vegas Gladiators. After 20 years as a familiar name to the league, an AFL mainstay, the Iowa Barnstormers, departed the league to join the Indoor Football League. The San Antonio Talons folded on October 13, 2014, after the league (which owned the team) failed to find a new owner. On November 16, 2014, despite a successful season record-wise, the Pittsburgh Power became the second team to cease operations after the 2014 season. This resulted from poor attendance. It was later announced by the league that the Power would go dormant for 2015 and were looking for new ownership.

Now answer this question: What was the original intended home field of the Las Vegas Outlaws?

Output: MGM Grand Garden Arena

Input: Article: The Japanese launch was followed in March 1983 by the introduction of CD players and discs to Europe and North America (where CBS Records released sixteen titles). This event is often seen as the "Big Bang" of the digital audio revolution. The new audio disc was enthusiastically received, especially in the early-adopting classical music and audiophile communities, and its handling quality received particular praise. As the price of players gradually came down, and with the introduction of the portable Walkman the CD began to gain popularity in the larger popular and rock music markets. The first artist to sell a million copies on CD was Dire Straits, with their 1985 album Brothers in Arms. The first major artist to have his entire catalogue converted to CD was David Bowie, whose 15 studio albums were made available by RCA Records in February 1985, along with four greatest hits albums. In 1988, 400 million CDs were manufactured by 50 pressing plants around the world.

Now answer this question: How many studio albums did David Bowie release in February 1985?

Output:
15