class Hailstone:
    def __init__(self, sx, sy, sz, vx, vy, vz):
        self.sx = sx
        self.sy = sy
        self.sz = sz
        self.vx = vx
        self.vy = vy
        self.vz = vz
        
        self.a = vy
        self.b = -vx
        self.c = vy * sx - vx * sy
    
    def __repr__(self):
        return "Hailstone{" + f"a={self.a}, b={self.b}, c={self.c}" + "}"

hailstones = [Hailstone(*map(int, line.replace("@", ",").split(","))) for line in open("data/day24.txt")]

total = 0

for i, hs1 in enumerate(hailstones):
    for hs2 in hailstones[:i]:
        a1, b1, c1 = hs1.a, hs1.b, hs1.c
        a2, b2, c2 = hs2.a, hs2.b, hs2.c
        if a1 * b2 == b1 * a2:
            continue
        x = (c1 * b2 - c2 * b1) / (a1 * b2 - a2 * b1)
        y = (c2 * a1 - c1 * a2) / (a1 * b2 - a2 * b1)
        if 200000000000000 <= x <= 400000000000000 and 200000000000000 <= y <= 400000000000000:
            if all((x - hs.sx) * hs.vx >= 0 and (y - hs.sy) * hs.vy >= 0 for hs in (hs1, hs2)):
                total += 1

print(total)