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();
        boolean ans = true;
        if(n!=2)
        {
            int x1 = in.nextInt();
            int y1 = in.nextInt();
            int x2 = in.nextInt();
            int y2 = in.nextInt();    
            for(int a0 = 0; a0 < n-2; a0++)
            {
                
                int x3 = in.nextInt();
                int y3 = in.nextInt();    
                int s = (y3 - y2) * x1 + (x2 - x3) * y1 + (x3 * y2 - x2 * y3);
                if(s!=0)
                {
                    ans = false;
                     
                    break;
                }
                x1=x2;
                x2=x3;
                y1=y2;
                y2=y3;
            
            }
            
        }
       if(ans)
           System.out.println("YES");
        else
            System.out.println("NO");  
    }
}