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 a0 = 0; a0 < n; a0++){
             x[a0] = in.nextInt();
             y[a0] = in.nextInt();
        }
        int f=1;
        if((x[1]-x[0]==0) || (y[1]-y[0]==0))
        //System.out.println(m);
        {for(int i=2;i<n;i++)
            {
            if(((y[i]-y[0])*(x[1]-x[0]))==((y[1]-y[0])*(x[i]-x[0])))
                {
                f=1;
            }
            else
                {
                f=0;
                break;
            }
        }
        if(f==1)
            {
            System.out.println("YES");
               
        }
        else
            {
            System.out.println("NO");
        }
    }
    
    else
        {
        System.out.println("NO");
    }
}
}