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 JAVA):

Solution:
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    static int n;
    static Integer[] a;
    public static void main(String[] args) throws IOException {
        //BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        //n = p(br.readLine());
        //String[] line = br.readLine().split(" ");
        Scanner reader = new Scanner(new BufferedInputStream(System.in));
        n = reader.nextInt();
        a = new Integer[n];
        for (int i = 0; i < n; i++)
            //a[i] = p(line[i]);
            a[i] = reader.nextInt();
        Arrays.sort(a);
        int head = 0, tail = 0, num = 0, max = 0;
        for (int i = 0; i < n; i++) {
            while (head + 1 < n && a[head + 1] - a[i] <= 5) head++;
            max = Math.max(max, head - i + 1);
        }
        System.out.println(max);
    }
    static int p(String in){
        return Integer.parseInt(in);
    }
}