#include<iostream>
#include<string>
#include<map>

int main() {
	int n;
	std::cin >> n;

	std::map<std::string, int> m;
	for (int i = 0; i < n; i++) {
		std::string s;
		std::cin >> s;
		m[s]++;
	}

	for (auto i = m.begin(); i != m.end(); i++) {
		if (i->second > n / 2) {
			std::cout << "NO" << std::endl;
			return 0;
		}
	}

	std::cout << "YES" << std::endl;
	return 0;
}