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 x1 = in.nextInt();
        int y1 = in.nextInt();
        int x2 = in.nextInt();
        int y2 = in.nextInt();
        double slope = getSlope(x1,x2,y1,y2);
        double newSlope;
        for(int a0 = 2; a0 < n; a0++){
            x1=x2;
            y1=y2;
            x2 = in.nextInt();
            y2 = in.nextInt();
            newSlope = getSlope(x1,x2,y1,y2);
            if (newSlope!=slope) {
                System.out.println("NO");
                return;
            }
        }
        System.out.println("YES");
    }
    
    private static double getSlope(int x1, int x2, int y1, int y2) {
        int rise = y2-y1;
        int run = x2-x1;
        if (rise==0) {return run;}
        if (run==0) {return rise;}
        return (double)(rise/run);
    };
}