import math
import sys
from collections import Counter


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n = int(input())
    c = Counter(input() for _ in range(n))
    if 2*c.most_common(1)[0][1] > n+1:
        print('NO')
    else:
        print('YES')


if __name__ == '__main__':
    main()