In this task, you're given passages that contain mentions of the quantity of a particular object and are supposed to find out the answer for a given question. Craft one correct answer to the question given in input. Make sure your correct answer is consistent with the context, and properly gives the exact number relating to the query.
 In your answer, use as few words as possible from the given context. To be less repetitive, please vary your language for each question.

Ex Input:
Sentence: About 80% of undergraduates and 20% of graduate students live on campus. The majority of the graduate students on campus live in one of four graduate housing complexes on campus, while all on-campus undergraduates live in one of the 29 residence halls. Because of the religious affiliation of the university, all residence halls are single-sex, with 15 male dorms and 14 female dorms. The university maintains a visiting policy (known as parietal hours) for those students who live in dormitories, specifying times when members of the opposite sex are allowed to visit other students' dorm rooms; however, all residence halls have 24-hour social spaces for students regardless of gender. Many residence halls have at least one nun and/or priest as a resident. There are no traditional social fraternities or sororities at the university, but a majority of students live in the same residence hall for all four years. Some intramural sports are based on residence hall teams, where the university offers the only non-military academy program of full-contact intramural American football. At the end of the intramural season, the championship game is played on the field in Notre Dame Stadium. 
Question: How many dorms for males are on the Notre Dame campus?

Ex Output:
15


Ex Input:
Sentence: The last opus number that Chopin himself used was 65, allocated to the Cello Sonata in G minor. He expressed a deathbed wish that all his unpublished manuscripts be destroyed. At the request of the composer's mother and sisters, however, his musical executor Julian Fontana selected 23 unpublished piano pieces and grouped them into eight further opus numbers (Opp. 66–73), published in 1855. In 1857, 17 Polish songs that Chopin wrote at various stages of his life were collected and published as Op. 74, though their order within the opus did not reflect the order of composition. 
Question: How many unfinished pieces did Julian Fontana make into eight more opus numbers?

Ex Output:
23


Ex Input:
Sentence: Montana contains thousands of named rivers and creeks, 450 miles (720 km) of which are known for "blue-ribbon" trout fishing. Montana's water resources provide for recreation, hydropower, crop and forage irrigation, mining, and water for human consumption. Montana is one of few geographic areas in the world whose rivers form parts of three major watersheds (i.e. where two continental divides intersect). Its rivers feed the Pacific Ocean, the Gulf of Mexico, and Hudson Bay. The watersheds divide at Triple Divide Peak in Glacier National Park. 
Question: How many miles of rivers are known for high class trout?

Ex Output:

450