Explain simply why fifteen is the correct answer to: Passage: The Games featured 102 events in fifteen sports, with the addition of "big air" snowboarding, mass start speed skating, mixed doubles curling, and mixed team alpine skiing to the Winter Olympic programme. 2,914 athletes from 92 NOCs competed, including the debuts of Ecuador, Eritrea, Kosovo, Malaysia, Nigeria and Singapore. After a state-sponsored doping program was exposed following the 2014 Winter Olympics, the Russian Olympic Committee was suspended, and selected athletes were allowed to compete neutrally under the IOC designation of "Olympic Athletes from Russia". Despite tense relations, North Korea agreed to participate in the Games, enter with South Korea during the opening ceremony as a unified Korea, and field a unified team in women's ice hockey.

Question: Based on this passage, how much sports are there in the winter olympics?. Explanation:
The relevant information is: The Games featured 102 events in fifteen sports, with the addition of "big air" snowboarding, mass start speed skating, mixed doubles curling, and mixed team alpine skiing to the Winter Olympic programme.