using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());

        Dictionary<string, int> etoList = new Dictionary<string, int>();
        string eto = "";

        for (int i = 0; i < N; i++)
        {
            eto = Console.ReadLine();
            if (!etoList.ContainsKey(eto)) { etoList.Add(eto, 0); }
            etoList[eto] = int.Parse(etoList[eto].ToString()) + 1;
        }

        Console.WriteLine(etoList.OrderBy(x => x.Value).Last().Value <= (double)N / 2 ? "YES" : "NO");
    }
}