from lib import *

second = True
data = open(0).read()

res = 0
if not second:
    for row in data.splitlines():
        a, b, c = list(map(int, row.split()))
        if a + b > c and a + c > b and b + c > a:
            res += 1
else:
    rows = list(map(lambda row: row.split(), data.splitlines()))
    for coli in range(len(rows[0])):
        for rowi in range(0, len(rows), 3):
            a = int(rows[rowi][coli])
            b = int(rows[rowi + 1][coli])
            c = int(rows[rowi + 2][coli])
            if a + b > c and a + c > b and b + c > a:
                res += 1
print(res)