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

class No349
{
    static void Main()
    {
        var num = Int32.Parse(Console.ReadLine());
        var dic = new Dictionary<string, int>();
        for (int i = 0; i < num; ++i)
        {
            var key = Console.ReadLine();
            if (dic.ContainsKey(key)) dic[key]++; 
            else dic.Add(key, 1);
        }
        var max = dic.Values.Max();
        var count = num % 2 == 0 ? num / 2 : num / 2 + 1;
        Console.WriteLine(max <= count?"YES":"NO");
    }
}