n = int(input())
A = [str(input()) for _ in range(n)]
from collections import Counter
C = Counter(A)
V = list(C.values())
V.sort(reverse=True)
if len(V) == 1:
    print('NO')
else:
    if sum(V[1:]) >= V[0]-1:
        print('YES')
    else:
        print('NO')