Problem: 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.

Input

The first line of the input contains one integer n (1 ≤ n ≤ 2 ⋅ 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.

Output

Print one integer — the maximum possible number of students in a balanced team.

Examples

Input


6
1 10 17 12 15 2


Output


3


Input


10
1337 1337 1337 1337 1337 1337 1337 1337 1337 1337


Output


10


Input


6
1 1000 10000 10 100 1000000000


Output


1

Note

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).

Solution (in PYTHON3):

Solution:
num_student = int(input())
skills_student = sorted(input().split(), key=int)

def count(array, i, j):
    return int(array[j])-int(array[i])

def team(array):
    i=0
    j=0
    max_ = 1
    count_= 1
    while j+1 < len(array):
        if count(array, i, j+1) <=5:
            j+=1
            count_+=1
        else:
            max_ = max(max_, count_)
            if count_ > 1:
                count_-=1
            i+=1
            if i > j:
                j = i
    
    max_ = max(max_, (j-i)+1)
    return max_


print(team(skills_student))