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 CPP):

Solution:
#include <bits/stdc++.h>
int main() {
  const unsigned MAX_DELTA = 5U;
  unsigned n;
  std::cin >> n;
  std::vector<unsigned> a(n);
  for (unsigned i = 0U; i < n; i++) {
    std::cin >> a[i];
  }
  std::sort(a.begin(), a.end());
  auto left = a.begin();
  auto right = a.begin();
  while (right != a.end() - 1U) {
    if (*(right + 1) - *left <= MAX_DELTA) {
      right++;
    } else {
      right++;
      left++;
    }
  }
  std::cout << 1U + std::distance(left, right);
}