#include <bits/stdc++.h>
#define PI 3.14159265359
#define MAX 10000
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int N;
	cin >> N;

	struct info {
		string eto;
		int count;

		bool operator<(const info& right) const {
			return count == right.count ? eto < right.eto : count < right.count;
		}
	};

	vector<struct info> v;
	for (int i = 0; i < N; i++) {
		string s;
		cin >> s;

		int f = 1;
		for (int j = 0; j < v.size(); j++) {
			if (v.at(j).eto == s) {
				f = 0;
				v.at(j).count++;
			}
		}

		if (f) {
			struct info inf = { s,1 };
			v.push_back(inf);
		}
	}
	sort(v.begin(), v.end());

	int n = v.at(v.size() - 1).count;
	//cout << n << endl;
	if (n <= ((N + 1) / 2)) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}