#!/bin/python

import sys


n = int(raw_input().strip())
prev_x = 0
prev_y = 0
prev_dx = 0
prev_dy = 0
line = True
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    if a0 == 0:
        prev_x = x
        prev_y = y
    elif a0 == 1:
        prev_dx = x - prev_x
        prev_dy = y - prev_y
        prev_x = x
        prev_y = y
    else:
        dx = x - prev_x
        dy = y - prev_y
        if not (prev_dx == 0 and dx == 0):
            if prev_dx == 0 and dx != 0 or 1. * dx / prev_dx * prev_dy != dy:
                line = False
                break
        prev_dx = dx
        prev_dy = dy
        prev_x = x
        prev_y = y

if line:
    print "YES"
else:
    print "NO"