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 flag=0;
        int []x = new int [20];
        int []y = new int [20];
        for(int a = 0; a < n; a++){
             x[a] = in.nextInt();
             y[a] = in.nextInt();
        }
        if(x[1]-x[0]==0)
            {
            for(int i = 2;i<n;i++)
                if(x[i]!=x[0]){
                flag = 1;
                break;
            }
        }
        else
        {
        double m = (y[1]-y[0])/(x[1]-x[0]);
        double c = y[1]-(m*x[0]);
        for(int i = 2;i<n;i++)
        {
            
            if(y[i]!=(m*x[i]+c)){
               flag=1;
                break;
            }
               }  
        }
               if(flag==0)
               System.out.println("YES");
               else
               System.out.println("NO");
        
    }
}