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

class Program {
  static void Main() {
    var n = int.Parse(Console.ReadLine());
    var s = "";
    var d = new Dictionary<string, int>();
    while ((s = Console.ReadLine()) != null) {
      if (d.ContainsKey(s)) d[s]++;
      else d[s] = 1;
    }
    if (d.Values.Max() > (n + 1) / 2) {
      Console.WriteLine("NO");
    } else {
      Console.WriteLine("YES");
    }
  }
}