A simple recommendation system would recommend a user things liked by a certain number of their friends. In this problem you will implement part of such a system.
You are given user's friends' opinions about a list of items. You are also given a threshold T − the minimal number of "likes" necessary for an item to be recommended to the user.
Output the number of items in the list liked by at least T of user's friends.
Output
Output an integer − the number of items liked by at least
T of user's friends.