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[] ax = new int[n];
        int[] ay = new int[n];
        
        float[] ag = new float[n - 1];
        String result = "YES";
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            ax[a0] = x;
            ay[a0] = y;
            if (a0 > 2) {
                
                
                if (Math.abs(ay[a0 - 1] - y) != Math.abs(ay[a0 -2] -ay[a0 - 1]) ||
                   Math.abs(ax[a0 - 1] - x) != Math.abs(ax[a0 -2] -ax[a0 - 1])) {
                    result = "NO";
                }
                
                
            }
        }
        
        System.out.println(result);
    }
}