#yuki_349

n=int(raw_input())
a=[raw_input() for _ in xrange(n)]
maxcnt=0
for i in xrange(n):
 if a.count(a[i])>maxcnt:
  maxcnt=a.count(a[i])
if maxcnt<=(n+1)/2:
 print "YES"
else:
 print "NO"