n = int(input())

d = {}
for _ in range(n):
    x = input()
    if not x in d:
        d[x] = 1
    else:
        d[x] += 1

if n % 2 == 0:
    if max(d.values()) <= n//2:
        print('YES')
    else:
        print('NO')
else:
    if max(d.values()) <= n//2 + 1:
        print('YES')
    else:
        print('NO')