from collections import Counter
N = int(input())
A = [input() for _ in range(N)]
cnt = Counter(A)

most_common_item = cnt.most_common()[0][1]
nokori = N - most_common_item

# 間：most_common_item - 1
# nokori が 間の個数以上あればよい
if nokori >= most_common_item - 1:
    print('YES')
else:
    print('NO')