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[] points = new int[2 * n];
        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]);
            points[a0] = x;
            points[a0 + points.Length / 2] = y;
        }
        int vert_point = points[0];
        int hori_point = points[points.Length / 2];
        bool vert = true;
        bool hori = true;
        for(int i = 1; i < n; i++){
            if(vert){
                if(points[i] != vert_point){
                    vert = false;
                }
            }
        }
        for(int i = points.Length / 2 + 1; i < 2 * n; i++){
            if(hori){
                if(points[i] != hori_point){
                    hori = false;
                }
            }
        }
        Console.WriteLine((vert || hori) ? "YES" : "NO");
    }
}