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.*;
import java.util.*;

public class C{

	static int []nxt;
	static int [][]memo;
	static int dp(int idx,int rem) {
		if(rem==0 || idx==nxt.length)
			return 0;
		if(memo[idx][rem]!=-1)
			return memo[idx][rem];
		int ans=Math.max(dp(nxt[idx]+1,rem-1)+nxt[idx]-idx+1, dp(idx+1,rem));
		return memo[idx][rem]=ans;
	}
	public static void main(String[] args) throws IOException {
		Scanner sc=new Scanner();
		PrintWriter out=new PrintWriter(System.out);
		int n=sc.nextInt(),k=sc.nextInt();
		Integer[]a=new Integer[n];
		for(int i=0;i<n;i++)
			a[i]=sc.nextInt();
		
		Arrays.sort(a);
		nxt=new int [n];
		for(int i=0;i<n;i++) {
			nxt[i]=i;
			int lo=i,hi=n-1;
			while(lo<=hi) {
				int mid=lo+hi>>1;
				if(a[mid]-a[i]<=5) {
					nxt[i]=mid;
					lo=mid+1;
				}
				else
					hi=mid-1;
			}
		}
		memo=new int [n][k+1];
		for(int []x:memo)
			Arrays.fill(x, -1);
		out.println(dp(0, k));
		out.close();

	}
	static class Scanner
	{
		BufferedReader br;
		StringTokenizer st;
		Scanner(){
			br=new BufferedReader(new InputStreamReader(System.in));
		}
		Scanner(String fileName) throws FileNotFoundException{
			br=new BufferedReader(new FileReader(fileName));
		}
		String next() throws IOException {
			while(st==null || !st.hasMoreTokens())
				st=new StringTokenizer(br.readLine());
			return st.nextToken();
		}
		String nextLine() throws IOException {
			return br.readLine();
		}
		int nextInt() throws IOException{
			return Integer.parseInt(next());
		}
		long nextLong()  throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}
		double nextDouble() throws NumberFormatException, IOException {
			return Double.parseDouble(next());
		}
	}
}