#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
	int n;
	vector<string> v;

	cin >> n;
	for (int i = 0; i < n; i++) {
		string s;
		cin >> s;
		v.emplace_back(s);
	}

	for (const string& s : v) {
		if (count(v.begin(), v.end(), s) > (v.size() + 1) / 2) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;

	return 0;
}