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

int main()
{
	int N;
	cin >> N;
	map<string, int> mp;
	for( int i = 0; i < N; i++ ) {
		string A;
		cin >> A;
		mp[A]++;
	}

	int n = mp.size();
	vector<int> A( n );
	int idx = 0;
	for( auto it = mp.begin(); it != mp.end(); it++ ) {
		A[idx] = it->second;
		idx++;
	}
	sort( A.begin(), A.end(), greater<int>() );
	string ans = "NO";
	int rest = N - A[0];
	if( A[0] <= rest + 1 ) ans = "YES";

	cout << ans << endl;
}