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();
        if(n<3)
        {
            System.out.println("YES");
            return;
        }
        int xx[] = new int[2];
        int yy[] = new int[2];
        for(int a0 = 0; a0 < 2; a0++)
        {
            xx[a0] = in.nextInt();
            yy[a0] = in.nextInt();
        }
        int yc = yy[1] - yy[0];
        int xc = xx[1] - xx[0];
        int c = xx[0]*yc+yy[0]*xc;
        boolean b = true;
        for(int a0 = 2; a0 < n; a0++)
        {
            int x = in.nextInt();
            int y = in.nextInt();
            int tc = x*yc+y*xc;
            if(tc!=c)
            {
                b = false;
                break;
            }
        }
        if(b)
        {
            System.out.println("YES");
        }
        else
        {
            System.out.println("NO");
        }
        
    }
}