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 PYTHON):

Solution:
tamanho = int(raw_input())
nivel = map(int,raw_input().split())
ponteiro1 = 0
ponteiro2 = 1
tamanhomax = 1
somas = sorted(nivel)
#print somas
while ponteiro2 < tamanho:
    #print (ponteiro2 - ponteiro1)
    #print "-"
    #print (somas[ponteiro1 + ponteiro2] - somas[ponteiro1])
    #print ponteiro1, ponteiro2
    if somas[ponteiro2] - somas[ponteiro1] > 5:
        ponteiro1 += 1
    elif somas[ponteiro2] - somas[ponteiro1] <= 5:
        ponteiro2 += 1
    if ponteiro2 - ponteiro1 > tamanhomax:
        tamanhomax = ponteiro2 - ponteiro1

print tamanhomax