#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;
	map<string, int> mp;
	for (int i = 0; i < n; i++) {
		string s;
		cin >> s;
		mp[s]++;
	}
	int mx = 0;
	for (auto kv : mp) mx = max(mx, kv.second);
	if (n + 1 >= 2 * mx) {
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
}