B'You are a coach at your local university. There are n students under your supervision, the programming skill of the i -th student is a_i . You have to create a team for a new programming competition. As you know, the more students some team has the more probable its victory is! So you have to create a team with the maximum number of students. But you also know that a team should be balanced. It means that the programming skill of each pair of students in a created team should differ by no more than 5 . Your task is to report the maximum possible number of students in a balanced team. The first line of the input contains one integer n ( 1 <= n <= 2 cdot 10^5 ) -- the number of students. The second line of the input contains n integers a_1, a_2, ... , a_n ( 1 <= a_i <= 10^9 ), where a_i is a programming skill of the i -th student. Print one integer -- the maximum possible number of students in a balanced team. In the first example you can create a team with skills [12, 17, 15] . In the second example you can take all students in a team because their programming skills are equal. In the third example you can create a team consisting of a single student (and you cannot create a team consisting of at least two students). '...