#include <iostream>
#include <string>
#include <map>
using namespace std;

int n;
string a[50];
map<string, int> dict;

int main(){
	cin >> n;
	for( int i = 0; i < n; i++ ){
		cin >> a[i];
		if( dict.find(a[i]) == dict.end() ){ dict[a[i]] = 0; }
		dict[a[i]]++;
	}
	for( map<string, int>::iterator it = dict.begin(); it != dict.end(); it++ ){
		if( (*it).second > (n + 1) / 2 ){
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}