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 oldX = 0, oldY=0, slope=0, prevSlope=0;
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            if(a0 != 0) {
                if(x - oldX == 0) {
                    slope = y - oldY;
                } else {
                    slope = (y-oldY) / (x - oldX);    
                }
                
                if(a0 != 1) {
                    if(slope != prevSlope) {
                        System.out.println("NO");
                        return;
                    }
                }
                prevSlope = slope;
                oldX = x;
                oldY = y;
            } else {
                oldX = x;
                oldY = y;
            }
            
        }
        
        System.out.println("YES");
        
    }
}