#!/usr/bin/env python
#coding:utf8

def read():
    sList = []
    for i in range(input()):
        sList.append(raw_input())
    return sList


def work(sList):
    s2cnt = {}
    for s in sList:
        if s not in s2cnt:
            s2cnt[s] = 0
        s2cnt[s] = s2cnt[s] + 1

    maxCnt = 0
    for (s, cnt) in s2cnt.items():
        maxCnt = max(maxCnt, cnt)

    print "YES" if maxCnt <= (len(sList) + 1) / 2 else "NO"


if __name__ == "__main__":
    work(read())