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);
        boolean line =true;
        int n = in.nextInt();
        double dy;
        int px = in.nextInt();
        int py = in.nextInt();
        int x=in.nextInt();
        int y=in.nextInt();
        int dx= x-px;
        px = x;
        if(dx==0){
            for(int a0 = 2; a0 < n; a0++){
                x = in.nextInt();
                y = in.nextInt();
                if(x!=px){
                    line=false;
                    break;
                }
                px=x;
            }
        }else{
            
            dy= (y-py)/dx;
            py=y;
            for(int a0 = 2; a0 < n; a0++){
                x = in.nextInt();
                y = in.nextInt();
                if(((y-py)/(x-px))!=dy){
                    line=false;
                    break;
                }
                px=x;
                py=y;
            }
        }    
        
        
        if(line){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
        
    }
}