#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	map<string, int> m;
	int N;
	cin >> N;
	for (int i = 0; i < N; i++) {
		string s;
		cin >> s;
		m[s]++;
		if (m[s] > (N+1)/2) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;

	return 0;
}