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#!/usr/bin/env python3
import sys, re
lines=[[int(x) for x in re.findall(r"\d+",l)] for l in sys.stdin.read().split("\n")[:-1]]
count=0
for i in range(len(lines)//3):
for j in range(3):
a,b,c=[l[j] for l in lines[3*i:3*i+3]]
if a+b+c>2*max(a,b,c):
count+=1
print(count)
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