# No.349 干支の置き物
import math

n = int(input())
a = []
kinds = []
counts = []

for i in range(n):
    s = input()
    a.append(s)

    if s not in kinds:
        kinds.append(s)

for tmp in kinds:
    counts.append(a.count(tmp))

#print(a)
#print(kinds)
#print(counts)

print('YES' if max(counts) < math.ceil(n / 2) + 1 else 'NO')