#!/bin/python

import sys


n = int(raw_input().strip())
sumX=0
sumY=0
for a0 in xrange(n):
    
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    sumX+=x
    sumY+=y
    
if sumX==x or sumY==y:
    print 'YES'
else:
    print 'NO'