#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    string s;
    map<string, int> m;
    for (int i = 0; i < n; i++) {
        cin >> s;
        m[s]++;
        if (m[s] > ceil(n / 2.0)) {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
    return 0;
}