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 sum1=0,sum2=0,a=0,b=0;
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            sum1=sum1+x;
            sum2=sum1+y;
        }
        if(sum1/n==a || sum2/n==b){
            System.out.println("YES");
        }
        else
            System.out.println("NO");
    }
}