#!/bin/python

import sys

flag = 0
a = []
n = int(raw_input().strip())
for a0 in xrange(n):
        l = map(int, raw_input().split(" "))
        a.append(l)
x = 0
y = 0
for i in xrange(n):
        x += a[i][0]
        y += a[i][1]
if x / n == a[0][0] and x % n == 0:
        flag = 1
if y / n == a[0][1] and y % n == 0:
        flag = 1
if flag:
        print "YES"
else:
        print "NO"