#include <iostream>
#include <vector>
#include <string>
#include <map>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<string> A(N);
	for (int i = 0; i < N; i++){
		cin >> A[i];
	}
	map<string, int> mp;
	for (int i = 0; i < N; i++){
		mp[A[i]]++;
	}
	bool ok = true;
	for (auto P : mp){
		if (P.second > (N + 1) / 2){
			ok = false;
		}
	}
	if (ok){
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
}