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

using namespace std;

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

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

	int maxi = 0;
	for (auto p : animal) {
		maxi = max(maxi, p.second);
	}

	cout << (maxi <= (n + 1) / 2? "YES" : "NO") << endl;
	return 0;

}