#!/bin/python3

import sys

x1=[]
y1=[]
n = int(input().strip())
for a0 in range(n):
    x,y = input().strip().split(' ')
    x1.append(int(x))
    y1.append(int(y))
if(sum(x1) == x1[0]*n or sum(y1) == y1[0]*n):
    print("YES")
else:
    print("NO")