# coding: utf-8
#yuki_349
import sys

n=int(raw_input())
s=[]
for i in xrange(n):
 s.append(raw_input())
if len(s)==2:
 if s[0]==s[1]:
  print "NO"
  sys.exit()

sl=[s.count(word) for word in s]
if len(sl)/2+1>=max(sl):
 print "YES"
else:
 print "NO"