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

 class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int p[][]=new int[n][2];
        
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            p[a0][0]=x;
            p[a0][1]=y;
        }
       
       double xsum=0,ysum=0; 
        for(int i = 0; i < n; i++){
            xsum+=p[i][0];
            ysum+=p[i][1];
        }
        if(xsum/n==p[0][0]||ysum/n==p[0][1]){
            System.out.print("YES");
            
        }
        else{
            System.out.print("NO");}
    }
}