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 tempx = 0;
        int tempy = 0;
        
        int t1=0;
        int t2=0;
        
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            
            if(a0==0)
            {
            t1=x;
            t2=y;    
            }
            
            tempx=tempx+x;
            tempy=tempy+y;
        }
        
        if( (tempx==n*t1) || (tempy==n*t2) )
        {
         System.out.println("YES");   
        }
        else
        {
        System.out.println("NO");
        }
        
    }
}