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lifez/69A.py

Created April 23, 2013 14:01
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69A.py
n = int(raw_input())
x = 0
y = 0
z = 0
for i in range(0, n):
ss = raw_input().split(" ")
x += int(ss[0])
y += int(ss[1])
z += int(ss[2])
print "YES" if x == 0 and y == 0 and z == 0 else "NO"c
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