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[] x=new int[n];
        int[] y=new int[n];
        
        for(int i = 0; i < n; i++){
            x[i] = in.nextInt();
            y[i] = in.nextInt();
        }
        
        
        
        double m=0.0;
        
        
        
        if(x[1]-x[0]==0)
            m=(y[1]-y[0])/0.1;
        else
            m=(y[1]-y[0])/(x[1]-x[0]);
        
        if(x[1]-x[0]!=0 && m!=0)
        {
            System.out.println("NO");
            System.exit(0);
        }
        
        int flag=0;
        
        for(int i=n-1;i>0;i--)
        {
            if(x[i]-x[i-1]==0)
            {
                 if((y[i]-y[i-1])/0.1!=m)
                {
                    System.out.println("NO");
                    flag=1;
                    break;
                } 
            } 
            else
            {
                if((y[i]-y[i-1])/(x[i]-x[i-1])!=m)
                {
                    System.out.println("NO");
                    flag=1;
                    break;
                }
            }
            
        }
        if(flag==0)
            System.out.println("YES");
    }
}