#include <iostream>
#include <map>

using namespace std;

int main(int argc, const char* argv[])
{
	int N;
	cin >> N;
	string As[N];
	for (auto&& a : As) cin >> a;
	map<string, int> m;
	for (auto&& a : As) m[a]++;
	for (auto&& v : m)
		if (v.second > N / 2) {
			cout << "NO" << endl;
			return 0;
		}
	cout << "YES" << endl;
	return 0;
}