using System;
using System.Collections.Generic;

namespace _349
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Dictionary<string,int> dic = new Dictionary<string,int>();
            for (int i = 0; i < n; i++)
            {
                string s = Console.ReadLine();
                if (!dic.ContainsKey(s)) dic[s] = 0;
                dic[s]++;
            }
            int max = 0;
            foreach (var item in dic) max = Math.Max(max,item.Value);
            Console.WriteLine(max <= (n + 1) / 2 ? "YES" : "NO");
        }
    }
}