#include <iostream>
#include <map>
using namespace std;
int main(void) {
	int n;
	cin >> n;
	map<string, int> mp;
	string s;
	int max_num = 0;
	for (int i = 0; i < n; ++i) {
		cin >> s;
		++mp[s];
		max_num = max(max_num, mp[s]);
	}
	if (n - max_num >= max_num - 1) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}