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();
        double m =0;
        boolean infSlope=false;
        double y=0 ,x=0;
        String ans = "YES";
        for(int a0 = 0; a0 < n; a0++){
            double x1 = (double)in.nextInt();
            double y1 = (double)in.nextInt();
            if(a0==0){
                x=x1;y=y1;
            }else if(a0==1){
                if((x1-x)==0){
                    infSlope=true;
                }else{
                    m=(y1-y)/(x1-x);
                    if(m!=0){
                        ans="NO";
                        break;
                    }
                }
            }else{
                if(!infSlope){
                    double m_ = (y1-y)/(x1-x);
                    if(Math.abs(m_-m)>0.000000002){
                        ans="NO";
                        break;
                    }
                }else{
                    if((x1-x)!=0){
                        ans="NO";
                        break;
                    }
                }
            }
            
        }
        System.out.println(ans);
    }
}