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();
        if(n == 2) {
            System.out.println("YES");
            return;
        }
        int[] p1 = new int[2];
        int[] p2 = new int[2];
        
        p1[0] = in.nextInt();
        p1[1] = in.nextInt();
        
        p2[0] = in.nextInt();
        p2[1] = in.nextInt();
        
        double a = 0;
        if(p1[0]-p2[0] != 0) a = (p1[1]-p2[1]) / (p1[0]-p2[0]);
        // else a = (p1[1]-p2[1]) / Double.MAX_VALUE;
        
        double b = 0;
        if(a != 0) b = -a*p1[0] +p1[1];
        else b = p1[1];
        
        for(int a0 = 2; a0 < n; a0++){
            p2[0] = in.nextInt();
            p2[1] = in.nextInt();
            
            if( (p2[1] != a*p2[0] + b ) && (p1[0]-p2[0] != 0) ) {
                System.out.println("NO");
                return;
            }
        }
        System.out.println("YES");
    }
}