#!/bin/python

import sys
from math import fabs

n = int(raw_input().strip())
a = map(int,raw_input().strip().split(' '))

res = 0
for i in a:
    suma = 0
    b = []
    for j in a:
        b.append(i - j)
    if b.count(1) > b.count(-1):
        suma = b.count(1) + b.count(0)
    else:
        suma = b.count(0) + b.count(-1)
    #print b,suma
    if res < suma:
        res = suma
print res