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

#define rep(i,a,b) for(int i=a;i<b;i++)

int main()
{
	int N; cin >> N;

	if (N == 1)
	{
		cout << "YES" << endl;
		return 0;
	}
	else if (N == 2)
	{
		string a, b;
		cin >> a >> b;
		if (a == b)
			cout << "NO" << endl;
		else
			cout << "YES" << endl;
		return 0;
	}

	map<string, int> A;
	rep(i, 0, N)
	{
		string a;
		cin >> a;
		A[a]++;
	}

	for (pair<string, int> p : A)
	{
		if (N - p.second < (p.second - 1))
		{
			cout << "NO" << endl;
			return 0;
		}
	}

	cout << "YES" << endl;
}