using System;
using System.Collections.Generic;
using System.Linq;
class Program {
    static void Main() {
        int n = int.Parse(Console.ReadLine());
        Dictionary<string, int> etos = new Dictionary<string, int>();

        for (int i = 0; i < n; i++) {
            string add = Console.ReadLine();
            if (etos.Keys.Contains(add)) ++etos[add];
            else etos.Add(add, 1);
        }
        int max = etos.Max(x => x.Value);
        Console.WriteLine((n + 1) / 2 < max ? "NO" : "YES");
    }
}