import sys
import re
niz= sys.stdin.readlines()
for x in range(len(niz)):
    niz[x]=niz[x].strip('\n')
dsa=[]
saf=0
for x in niz:
    asd=x.strip(' ').split(' ')
    asd=list(filter(None, asd))
    dsa.append(asd[:])
for x in range (int(len(dsa)/3)):
    for z in range(3):
        asd[0]=dsa[0+(3*x)][z]
        asd[1]=dsa[1+(3*x)][z]
        asd[2]=dsa[2+(3*x)][z]
        for y in range(3):
            asd[y]=int(re.search(r'\d+', asd[y]).group())
        if(asd[0]<asd[1]+asd[2] and asd[1]<asd[0]+asd[2] and asd[2]<asd[1]+asd[0]):
            saf+=1
sys.stdout.write(str(saf))