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

int main() {
    int N;
    cin >> N;
    map<string, int> eto;
    for (int i = 0; i < N; i++) {
        string A;
        cin >> A;
        eto[A] += 1;
    }

    int m = 0;
    for (map<string, int>::iterator it = eto.begin(); it!=eto.end(); it++) {
            m = max(m,(*it).second);
    }
    if ((N+1)/2 >= m) {
        cout << "YES" << endl;}
    else {
        cout << "NO" << endl;}
    return 0;
}