#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>

using namespace std;

int main() {
    int N;
    cin >> N;
    vector<string> s(N);
    map<string, int> m;
    int value = 0;
    for(int i = 0; i < N; i++) {
        cin >> s[i];
        m[s[i]]++;
        value = max(value, m[s[i]]);
    }
    
    cout << (value > (N+1) / 2 ? "NO" : "YES") << endl;
}