import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        
        ArrayList<Point> points = new ArrayList<Point>();
        
        for(int a0 = 0; a0 < n; a0++){
            Point p = new Point();
            p.setX(in.nextInt());
            p.setY(in.nextInt());
            points.add(p);
        }
        
        if(checkOnLine(points)){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
    }
    
    public static boolean checkOnLine(ArrayList<Point> points){
        
        ArrayList<Integer> xValues = new ArrayList<Integer>();
        ArrayList<Integer> yValues = new ArrayList<Integer>();
        
        for(Point p : points){
            xValues.add(p.getX());
            yValues.add(p.getY());
        }
        return checkHorizontal(xValues)? true:checkVertical(yValues);
    }
    
    public static boolean checkHorizontal(ArrayList<Integer> xValues){
       for(int i=1;i<xValues.size();i++){
            if(xValues.get(i) != xValues.get(i-1)){
                return false;
            }
          
        }
        return true;
    }
    
    public static boolean checkVertical(ArrayList<Integer> yValues){
        for(int i=1;i<yValues.size();i++){
            if(yValues.get(i) != yValues.get(i-1)){
                return false;
            }
        }
        return true;
    }
}



class Point{
    private int x;
    private int y;
    
    public int getX(){
        return this.x;
    }
    
    public int getY(){
        return this.y;
    }
    
    public void setX(int x){
        this.x = x;
    }
    
    public void setY(int y){
        this.y = y;
    }
}