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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int[] inpt = Reader.GetInt();
        int blockCount = inpt[0];
        int blockLength = inpt[1];
        int[] cnt = new int[blockLength + 2];
        for(int i=0; i<blockCount; i++) {
           inpt = Reader.GetInt();
           cnt[inpt[0]] += 1;
           cnt[inpt[1]+1] -= 1;
        }
        int siki = blockLength / 2 + 1;
        if(blockLength % 2 == 1) {
            siki++;
        }
        int[] val = new int[blockLength + 1];
        int currentVal = 0;
        for(int i=1; i<blockLength; i++) {
            currentVal += cnt[i];
            val[i] = currentVal;
        }
        for(int i=siki; i<=blockLength; i++) {
            val[blockLength - i + 1] += val[i];
        }
        bool isYes = true;
        for(int i=1; i<=blockLength / 2; i++) {
            if(val[i] > 2) {
                isYes = false;
                break;
            }
        }
        if(isYes && blockLength % 2 > 0) {
            if(val[blockLength / 2 + 1] > 1) {
                isYes = true;
            }
        }
        Console.WriteLine(isYes?"YES":"NO");
    }

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


5 10
8 8
0 0
2 4
2 3
8 8




 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}