# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	D = defaultdict(int)
	for i in range(N):
		A = input()
		D[A] += 1

	L = []
	for i in D:
		L.append(D[i])

	for i in L:
		if i >= (N + 3) // 2:
			print("NO")
			return

	print("YES")


if __name__ == '__main__':
	main()