#!/bin/python import sys n = int(raw_input().strip()) a = map(int,raw_input().strip().split(' ')) for i in xrange(len(a)): if a[i] < 0: a[i] = 0 - a[i] a.sort() start = a[0] max = 1 curr = 0 for i in xrange(len(a)): if a[i] - start <= 1: curr += 1 else: if max < curr: max = curr curr = 1 start = a[i] if max < curr: max = curr print max