import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static Integer currx;
    public static Integer curry;
    public static Integer prevx;
    public static Integer prevy;
    
    public static Float m;
    public static Float c;
    public static boolean verticalLine = false;
    
    // y = mx + c;
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            currx = x;
            curry = y;
            if (verticalLine && (currx - prevx) !=0 ) {
                System.out.println("NO");
                return;
            }
                
            if (prevx != null && prevy != null) {
                if ((prevx - currx) != 0 ){
                    float currm = (prevy - curry)/(prevx - currx);
                    if (m != null && currm != m) {
                        System.out.println("NO");
                        return;
                    }
                    m = currm;
                } else {
                    verticalLine = true;
                }
                
                
                if (!verticalLine) {
                    float currc = curry - m*currx;
                    if (c != null && c != currc) {
                        System.out.println("NO");
                        return;                        
                    }
                    c = currc;
                }
            }
            
            prevx = currx;
            prevy = curry;
            
        }
        
        System.out.println("YES");
    }
}