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

     static void Main(string[] args)
        {
          


            //(x - x1) / (x2 - x1) = (y - y1) / (y2 - y1)
            int n = Convert.ToInt32(Console.ReadLine());

            int[] a = new int[10];
            int[] b = new int[10];
            int pointx = 0;
         int pointy = 0;
            int count1 = 0;
            int count2 = 0;
            int countz = 0;
            for (int a0 = 0; a0 < n; a0++)
            {
                string[] tokens_x = Console.ReadLine().Split(' ');
                int x = Convert.ToInt32(tokens_x[0]);
                int y = Convert.ToInt32(tokens_x[1]);

                a[a0] = x;
                b[a0] = y;

                if (a0 == 0)
                {
                    pointx = x;
                    pointy = y;
                }
                if (pointx == x)
                {
                    count1++;
                }
                if (pointy == y)
                {
                    count2++;
                }

            }
            for (int i = 0; i < n - 2; i++)
            {
                //(x - x1) / (x2 - x1) = (y - y1) / (y2 - y1)
                try
                {
                    if ((a[i] - a[i + 1]) / (a[i + 2] - a[i + 1]) == (b[i] - b[i + 1]) / (b[i + 2] - b[i + 1]))
                    {
                        countz++;
                    }
                }
                catch (Exception e )
                {
                    countz++;
                }

               

            }
            if (countz == n -2 && count2 == n || count1 == n)
            {
                   Console.WriteLine("YES"); 
               
            }
            else
            {
                Console.WriteLine("NO");
            }

           
        }
    }