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>
using namespace std;
template <class T>
bool uin(T& a, T b) {
  return a > b ? (a = b, true) : false;
}
template <class T>
bool uax(T& a, T b) {
  return a < b ? (a = b, true) : false;
}
int N, K;
int dp[5010][5010];
int a[5010], cnt[5010];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> N >> K;
  for (int i = 0; i < N; ++i) cin >> a[i];
  sort(a, a + N);
  for (int i = 0; i < N; ++i) {
    while (i + cnt[i] < N && a[i + cnt[i]] - a[i] <= 5) {
      ++cnt[i];
    }
  }
  for (int i = 0; i < N; ++i) {
    for (int j = 0; j <= K; ++j) {
      uax(dp[i + 1][j], dp[i][j]);
      if (j + 1 <= K) {
        uax(dp[i + cnt[i]][j + 1], dp[i][j] + cnt[i]);
      }
    }
  }
  cout << dp[N][K] << '\n';
}