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