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");            
        } else {
            int count = 0;
            double slope = 0.0;
            double intercept = 0.0;
            int[][] inputArray = new int[n][2];
            boolean isFlag = true;
            for(int i = 0; i < n; i++){
                inputArray[i][0] = in.nextInt();
                inputArray[i][1] = in.nextInt();
                if (count > 2){
                    double newslope;
                    double newintercept;
                    try {
                        newslope = (inputArray[i][1] - inputArray[i-1][1])/(inputArray[i][0] - inputArray[i-1][0]);
                        newintercept = (inputArray[i][1] - newslope * inputArray[i][0]);
                    } catch (Exception e){
                        newslope = Integer.MAX_VALUE;
                        newintercept = Integer.MAX_VALUE;
                    }
                    
                    if (newslope != slope || newintercept != intercept){
                        isFlag = false;
                        break;
                    }
                } else {                  
                   if (count == 1){
                       try{
                           slope = (inputArray[i][1] - inputArray[i-1][1])/(inputArray[i][0] - inputArray[i-1][0]);
                           intercept = (inputArray[i][1] - slope * inputArray[i][0]);
                       } catch (Exception e){
                           slope = Integer.MAX_VALUE;
                           intercept = Integer.MAX_VALUE;
                       }
                   }
                }
                count++;
            }
            if  (isFlag){
                System.out.println("YES");
            } else {
                System.out.println("NO");
            }
        }
        
    }
}