using System;
using System.Linq;

class A
{
	static int[] Read() => Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
	static (int, int) Read2() { var a = Read(); return (a[0], a[1]); }
	static void WriteYesNo(bool b) => Console.WriteLine(b ? "Yes" : "No");
	static void Main()
	{
		var (n, x) = Read2();
		var c = Read();
		WriteYesNo(c.Any(v => v <= x) && c.Any(v => v >= x));
	}
}