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();
        float sumx=0,sumy=0,x=0,y=0;
        for(int a0 = 0; a0 < n; a0++){
           if(a0==0)
               {
               x=in.nextFloat();
               y=in.nextFloat();
               sumx+=x;
               sumy+=y;
           }
            else{
            sumx+=in.nextFloat();;
            sumy+=in.nextFloat();
                // System.out.println(sumx +" "+sumy);
            }

        }
     // System.out.println(sumx +" "+sumy+" "+sumx/n+" "+sumy/n);
       if((sumx/n)==x || (sumy/n)==y)
           System.out.println("YES");
          else 
              System.out.println("NO");
        
    }
}