#!/bin/python

import sys


n = int(raw_input().strip())
yes = True
slope = None
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    if x == 0:
        y = 0
    if slope is None:
        slope = (x ,y)
    else:
        if (x, y) != slope:
            yes = False

if yes:
    print "YES"
else:
    print "NO"