#!/bin/python3

import sys

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