#!/bin/python3

import sys


n = int(input().strip())
l = []
for a0 in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    l.append([x,y])

if not any([l[i][0] - l[0][0] for i in range(n)]) or not any ([l[i][1] - l[0][1] for i in range(n)]):
    print("YES")
else:
    print("NO")