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 s=0;
        int k=0;
        int x=0,y=0;
        for(int a0 = 0; a0 < n; a0++){
             x = in.nextInt();
             y = in.nextInt();
             s=s+x;
            k=k+y;
            
           
        }
        
        if((s/n==x) || (k/n==y))
            System.out.println("YES");
        else
            System.out.println("NO");
        
        
        
    }
}