from collections import Counter

n = int(input())
i = 0
s = []
while i < n:
    s.append(input())
    i += 1
if n % 2 != 0:
    n += 1
j = n / 2 + 1
counter = Counter(s)
answer = "YES"
for word, c in counter.most_common():
    if c >= j:
        answer = "NO"
print(answer)