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;
bool Check(unsigned int N, int pos) { return (bool)(N & (1LL << pos)); }
long long Set(unsigned int N, int pos) { return N = N | (1LL << pos); }
long long n, a[1000005];
int main() {
  long long int ii, i, j, k, z = 0, c = 0, t, x, y, l, r, mid, m;
  char ch;
  cin >> n;
  for (i = 0; i < n; i++) {
    scanf("%lld", &a[i]);
  }
  sort(a, a + n);
  x = a[0];
  z = 1, c = 1;
  i = 0, j = 0;
  while (i < n && j < n) {
    if (i == j) {
      j++;
    } else if (a[j] - a[i] <= 5) {
      z = max(z, j - i + 1);
      j++;
    } else {
      i++;
    }
  }
  cout << z << endl;
}