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

public class Test
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());
		var list = new List<string>();
		for(int i = 0; i  < n; i++) list.Add(Console.ReadLine());
		var max = list.GroupBy(y => y)
					.Max(z => z.Count());
					
		if(max > ((n + 1) >> 1)) Console.WriteLine("NO");
		else Console.WriteLine("YES");
	}
}