def get_file(fn):
    for l in open(fn, 'r'):
        lst = list(map(lambda x: int(x), l.strip().split(',')))
        yield ((lst[0], lst[1]), (lst[2], lst[3]), (lst[4], lst[5]),
                (lst[0], lst[1]), (lst[2], lst[3]))

def pro_multi(p, q):
    return p[0] * q[1] - p[1] * q[0]

def judge(l):
    for i in range((len(l) + 1) // 2):
        if pro_multi(l[i + 1], l[i]) * pro_multi(l[i + 2], l[i]) > 0:
            return False
    return True

print(len(list(filter(judge, get_file('../resource/triangles.txt')))))