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

int n, m;
string s;
map<string, int> mp;

int main()
{
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        cin >> s;
        mp[s]++;
        m = max(mp[s], m);
    }
    cout << (2 * (m - 1) < n ? "YES" : "NO") << endl;
}