N = input()

LIST = [raw_input() for i in range(N)]

BBB = sorted(LIST)
CCC = list(set(BBB))
DDD = [0 for i in range(len(CCC))]
EEE = [CCC[i] for i in range(len(CCC))]

for i in range(len(EEE)):
  for j in range(len(BBB)):
    if BBB[j] == EEE[i]:
      DDD[i] += 1

FFF = sorted(DDD)

if N%2 == 0:
  if DDD[0] <= N/2:
    print "YES"
  else:
    print "NO"
else:
  if DDD[0] <= N/2+1:
    print "YES"
  else:
    print "NO"