import java.io.*;

import java.util.Collections;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.util.*;
public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        int b[]=new int[100];
        int b1[]=new int[99];
        for(int a_i=0; a_i < n; a_i++)
        {
            a[a_i] = in.nextInt();
            b[a[a_i]]++;
        }
              int max1;
        max1=2;
              for(int i=1;i<100;i++)
              {
              b1[i-1]=b[i-1]+b[i];
                  if(max1<b1[i-1])
                      max1=b1[i-1];
              }
             
        System.out.print(max1);
    }
}