n = int(input())

dic = {}

for i in range(n):
    a = input()
    if a not in dic:
        dic[a] = 1
    else:
        dic[a] += 1

maxd = max(dic.items(), key=lambda x: x[1])

if maxd[1] % 2 == 1:
    if (n + 1) / 2 >= maxd[1]:
        print('YES')
    else:
        print('NO')
else:
    if (n + 1) / 2 >= maxd[1]:
        print('YES')
    else:
        print('NO')