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.

Let me give you an example: Sentence: The New York metropolitan area is home to a self-identifying gay and bisexual community estimated at 568,903 individuals, the largest in the United States and one of the world's largest. Same-sex marriages in New York were legalized on June 24, 2011 and were authorized to take place beginning 30 days thereafter.
Question: How many people identify as gay or bisexual in NYC?
The answer to this example can be: 568,903
Here is why: There are total 568903 individuals who identify as gay or bisexual.

OK. solve this:
Sentence: One of the main driving forces in the growth of the University was its football team, the Notre Dame Fighting Irish. Knute Rockne became head coach in 1918. Under Rockne, the Irish would post a record of 105 wins, 12 losses, and five ties. During his 13 years the Irish won three national championships, had five undefeated seasons, won the Rose Bowl in 1925, and produced players such as George Gipp and the "Four Horsemen". Knute Rockne has the highest winning percentage (.881) in NCAA Division I/FBS football history. Rockne's offenses employed the Notre Dame Box and his defenses ran a 722 scheme. The last game Rockne coached was on December 14, 1930 when he led a group of Notre Dame all-stars against the New York Giants in New York City.
Question: How many national titles were won when Knute Rockne coached at Notre Dame?
Answer:
three