import collections

N = int(input().strip())
A = [input().strip() for _ in range(N)]

c = collections.Counter(A)
cc = sorted(list(c.items()), key = lambda x : x[1], reverse=True)
tmp = [cc[0][1], -(-(N / 2) // 1)]
print(['NO', 'YES'][tmp[0] <= tmp[1]])