#include <bits/stdc++.h>
using namespace std;
int n; string s; map<string, int> d;
int main() {
	cin >> n;
	for(int i = 0; i < n; i++) {
		cin >> s;
		d[s]++;
	}
	bool ok = true;
	for(pair<string, int> i : d) {
		if(i.second > n / 2 + n % 2) ok = false;
	}
	cout << (ok ? "YES" : "NO") << endl;
	return 0;
}