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

int main() {
    int N; cin >> N;
    int ma = 0;
    map<string, int> m;
    for(int i=0; i<N; ++i) {
        string a; cin >> a;
        ma = max(ma, ++m[a]);
    }
    if(ma > (N+1) / 2) {
        cout << "NO" << endl;
    } else {
        cout << "YES" << endl;
    }
}