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 x1 = in.nextInt();
        int y1 = in.nextInt();
        double slope = 0;
        
        for(int a0 = 1; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            
            if (a0 == 1){
                if (x != x1)
                    slope = (double)(y-y1)/(double)(x-x1);
                else
                    slope = Double.MAX_VALUE;
                
                //System.out.println("Slope = " + slope);
            }
            else{
                double slope1 = Double.MAX_VALUE;
                if (x != x1)
                    slope1 = (double)(y-y1)/(double)(x-x1);
                else if (x == x1 && y == y1)
                    slope1 = 1;
                    
                if (slope != slope1){
                    System.out.println("NO");
                    return;
                }
            }
        }
        System.out.println("YES");
    }
}