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

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

            var inputs = new List<string>();
            for (int i = 0; i < N; i++)
            {
                inputs.Add(Console.ReadLine());
            }

            if (inputs.GroupBy(i => i).Max(i => i.Count()) > ((N + 1) / 2))
            {
                Console.WriteLine("NO");
            }
            else
            {
                Console.WriteLine("YES");
            }
        }
    }
}