using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

     static void Main(String[] args)
        {
            int n = Convert.ToInt32(Console.ReadLine());
            int number = 0;
            string a = "YES";
            int number1 = 0;
            for (int a0 = 0; a0 < n; a0++)
            {
                string[] tokens_x = Console.ReadLine().Split(' ');
                int x = Convert.ToInt32(tokens_x[0]);
                int y = Convert.ToInt32(tokens_x[1]);

                if (n >= 2)
                {
                    if (a0 == 0)
                    {

                        number = x;
                        number1 = y;
                    }

                    if (number != x)
                    {

                        a = "NO";
                        //continue;
                    }
                    else if (number <= x)
                    {

                        a = "YES";
                    }

                    if (a == "NO")
                    {
                        if (number1 != y)
                        {

                            a = "NO";
                            break;
                        }
                        else if (number1 <= y)
                        {

                            a = "YES";
                        }
                    }
                }
                else
                {

                    a = "YES";
                }
            }

            Console.WriteLine(a);

        }
}