Problem:
Score : 300 points

Problem Statement

You are given an integer sequence of length N, a_1,a_2,...,a_N.

For each 1≤i≤N, you have three choices: add 1 to a_i, subtract 1 from a_i or do nothing.

After these operations, you select an integer X and count the number of i such that a_i=X.

Maximize this count by making optimal choices.

Constraints

1≤N≤10^5

0≤a_i<10^5 (1≤i≤N)

a_i is an integer.

Input

The input is given from Standard Input in the following format:

N
a_1 a_2 .. a_N

Output

Print the maximum possible number of i such that a_i=X.

Sample Input 1

7
3 1 4 1 5 9 2

Sample Output 1

4

For example, turn the sequence into 2,2,3,2,6,9,2 and select X=2 to obtain 4, the maximum possible count.

Sample Input 2

10
0 1 2 3 4 5 6 7 8 9

Sample Output 2

3

Sample Input 3

1
99999

Sample Output 3

1

Solution in C# (Mono 4.6.2.0) (judge verdict: Time Limit Exceeded)

using System;
using System.Linq;
public class s
{
  public static void Main()
  {
    int N = int.Parse(Console.ReadLine());
    int[] x=Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
    int i,j;
    int max=0;
    int ans=0;
    
    for(i=1;i<=100000;i++)
    {
      for(j=0;j<N;j++)
      {
        if(x[j]==i-1||x[j]==i||x[j]==i+1)ans+=1;
      }
      if(ans>max)max=ans;
      ans=0;
    }
    Console.WriteLine(max);
  }
}