#include <iostream>
#include <string>
#include <map>
using namespace std;
int main() {
	cin.tie(0); ios::sync_with_stdio(false);
	int N;	cin >> N;
	int key = N / 2 + N % 2;
	map<string, int> zodiac;
	for (int i = 0;i < N;i++) {
		string s; cin >> s;
		zodiac[s]++;
		if (zodiac[s] > key) { cout << "NO" << endl; return 0; }
	}
	cout << "YES" << endl;
	return 0;
}