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

bool solve() {
	int n;
	cin >> n;
	map<string, int> mp;
	for (int i = 0; i < n; i++) {
		string s;
		cin >> s;
		mp[s]++;
	}
	
	for (auto kv : mp) if (kv.second * 2 > n) return false;
	return true;
}

int main() {
	cout << (solve() ? "YES" : "NO") << endl;
}