#!/bin/python3

import sys


n = int(input().strip())
points = []
vertical = False
slope = b = 0
ans = "YES"
for a0 in range(n):
    x,y = input().strip().split(' ')
    points.append([int(x),int(y)])
    if len(points) == 2:
        if points[1][0] - points[0][0] == 0:
            vertical = True
        else:
            slope = (points[1][1] - points[0][1]) / (points[1][0] - points[0][0])
            b = -points[1][0]*slope + points[1][1]
    elif len(points) > 2:
        if vertical and points[a0][0] != points[0][0]:
            ans = "NO"
        if not vertical and points[a0][1] != slope*points[a0][0] + b:
            ans = "NO"
print(ans)