#!/bin/python

import sys

def isCollinear(x1, y1, x2, y2, x3, y3):
	return (y1 - y2) * (x1 - x3) == (y1 - y3) * (x1-x2)

n = int(raw_input().strip())
x1 = 0
x2 = 0
y1 = 0
y2 = 0

for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]

    if a0 == 0:
    	x1 = x
    	y1 = y
    elif a0 == 1:
    	x2 = x
    	y2 = y
    elif a0 > 1:
    	x3 = x
    	y3 = y
    	result = isCollinear(x1,y1, x2, y2, x3, y3)
    	if result == False:
    		print "NO"
    		exit()
print "YES"