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

int main(){
    int N;
    cin >> N;
    if(N == 1){
        cout << "YES" << endl;
        return 0;
    }
    vector<string> okimono;
    vector<int> okimono_num;
    for(int i = 0; i < N; i++){
        string animal;
        cin >> animal;
        for(int j = 0; j < okimono.size(); j++){
            if(okimono[j] == animal){
                okimono_num[j]++;
                animal = "";
                break;
            }
        }
        if(animal != ""){
            okimono.push_back(animal);
            okimono_num.push_back(1);
        }
    }
    for(int i = 0; i < okimono.size(); i++){
        if(okimono_num[i] > (N + 1) / 2){
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
}