using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());             
      
        string[] tokens_x = Console.ReadLine().Split(' ');
        int x1 = Convert.ToInt32(tokens_x[0]);
        int y1 = Convert.ToInt32(tokens_x[1]);
        
        tokens_x = Console.ReadLine().Split(' ');
        int x2 = Convert.ToInt32(tokens_x[0]);
        int y2 = Convert.ToInt32(tokens_x[1]);
        
        double slope = 0;
        var noSlope = false;
        if (x1 != x2)
        {                
            slope = (y2 - y1) / (double)(x2 - x1);
        }
        else
            {
            noSlope = true;
        }
        
        var b = y1 - (slope * x1);
        
        var isLine = true;        
        var points = 2;
        
        while (points < n && isLine)
            {
            tokens_x = Console.ReadLine().Split(' ');
            x1 = Convert.ToInt32(tokens_x[0]);
            y1 = Convert.ToInt32(tokens_x[1]);
        
            if (noSlope)
                {
                if (x1 != x2)
                    {
                    isLine = false;
                }
            }            
            else if (y1 != ((slope * x1) + b))
                {
                isLine = false;
            }            
            
            points++;
        }
        
        if (isLine) { Console.WriteLine("YES"); }
        else { Console.WriteLine("NO"); }
    }
}