n = int(input())
S = [input()for x in '_'*n]
d = {}
for i in S:
    if i in d:
        d[i] += 1
    else:
        d[i] = 1
m = 0
for i in d.values():
    if i>m : m = i
print('NO'if n//2+n%2 else'YES')