# -*- coding: utf-8 -*-
import collections
N = input()
Elist = []
for i in range(N):
    Elist.append(raw_input())
count_dict = collections.Counter(Elist)
maxdec = count_dict.most_common(1)
maxn = maxdec[0][1]
bound = N // 2 + N % 2
if bound < maxn:
    print "NO"
else:
    print "YES"