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.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.StringTokenizer;

public class Main {

	static InputReader scan = new InputReader(new BufferedInputStream(System.in));
	static ArrayList<Integer> list = new ArrayList<>();
	static int loss = 0;

	public static void main(String[] args) {
		int n = scan.nextInt();
		for (int i = 0; i < n; i++) {
			list.add(scan.nextInt());
		}
		Collections.sort(list);
		int max = 1;
		loss = list.get(0);
		for (int i = 0; i < n; i++) {
			if (max >= n - i)
				break;
			if(i>0&&list.get(i-1)==list.get(i)) {
				continue;
			}
			int temp = fun(i);
			if (temp > max) {
				max = temp;
			}
			for( ;i+1<n&&Math.abs(list.get(i+1)-loss)>5;i++) {
				
			}
			
		}
		System.out.println(max);
	}

	static int fun(int n) {
		int num = list.get(n);
		int count = 0;
		for (int i = n ; i < list.size(); i++) {
			if (Math.abs(list.get(i) - num) <= 5) {
				count++;
			} else {
				
				//    +++
				loss = list.get(i);
				break;
			}
		}
		return count;
	}

	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
}