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();
        int xc[]=new int[n];
        int yc[] =new int[n];
        for(int a0 = 0; a0 < n; a0++){
             xc[a0] = in.nextInt();
             yc[a0] = in.nextInt();
        }
        int suc=1;
        int compare=0;
        int x=0;int y=0;
        x=xc[1]-xc[0];
        y=yc[1]-yc[0];
        if(x==0)
            {
            compare=xc[0];
            for(int i=1;i<n;i++)
                {
                if(xc[i]!=compare)
                   { suc=0;
                    break;
                   }
            }
            if(suc==1)
                System.out.println("YES");
             else
            System.out.println("NO");
            
        }
        else if(y==0)
            {
            compare=yc[0];
             for(int i=1;i<n;i++)
                {
                if(yc[i]!=compare)
                   { suc=0;
                    break;}
            }
            if(suc==1)
                System.out.println("YES");
            else
            System.out.println("NO");
        }
        else
            System.out.println("NO");
        
    }
}