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();
        boolean parallelX = false, parallelY = false;
        int m = 0;
        int c=0;
        if(x2-x1 == 0){
            parallelY = true;
        }else{
            m = (y2-y1)/(x2-x1);
        }
        if(parallelY==true){
            c=x1;
        }else if(m==0){
            c=y1;
        }else{
            c = y1-(m*x1);
        }
        for(int a0 = 2; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            if(parallelY==true && x!=c){
                System.out.println("NO");
                return;
            }else if(parallelY == false && y!=((m*x) + c)){
                    System.out.println("NO");
                    return;
            }
        }
        System.out.println("YES");
        return;
    }
}