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

namespace yukicodeX {
    public class ProgramX {
        public static string Solver(System.IO.TextReader reader) {
            var n = int.Parse( reader.ReadLine() );
            var x = 0;
            var figures = new Dictionary<string, int>();
            for (var i = 0; i != n; ++i) {
                var buf = reader.ReadLine().Split();
                if (figures.ContainsKey( buf[ 0 ] )) figures[ buf[ 0 ] ] += 1;
                else figures.Add( buf[ 0 ], 1 );
                if (figures[ buf[ 0 ] ] > x) ++x;
            }
            return n % 2 == 0 ? x > n / 2 ? "NO" : "YES" : x > n / 2 + 1 ? "NO" : "YES";
        }

        private static void Main() {
            Console.WriteLine( Solver( Console.In ) );
        }
    }
}