p, a, d = 0, [[], [], []], open('03.inp', 'r').read().split('\n')
for i in d:
    for j in range(3):
        a[j].append(i.split()[j])
        if len(a[j]) == 3:
            x, y, z = [int(t) for t in a[j]]
            p, a[j] = p + 1 if x + y > z and x + z > y and y + z > x else p, []
print p