import math

n, w = map(lambda s_: int(s_), input().split())
sushi = [tuple(map(lambda s_: int(s_), input().split())) for _ in range(n)]
sushi.append((0, 0, 0, 0, 0))


def pos_when(i, t):
    x, y, r, v, a = sushi[i]
    theta = (v * t + a) * math.pi / 180
    return x + r * math.cos(theta), y + r * math.sin(theta)


def next_time(v, t0, nv):
    p = pos_when(v, t0)

    def pred(dt):
        np = pos_when(nv, t0 + dt)
        d = (p[0] - np[0]) ** 2 + (p[1] - np[1]) ** 2
        return d <= (w * dt)**2

    # if pred(0):
    #     return t0
    ng = 0
    ok = 1e-5
    c = 0
    while not pred(ok):
        ng, ok = ok, ok * 2
        c += 1
    for _ in range(30 + c):
        mi = (ng + ok) / 2
        if pred(mi):
            ok = mi
        else:
            ng = mi
    return t0 + ok


oo = 1e1000
n2 = 1 << n + 1
dp = [[oo] * n2 for _ in range(n + 1)]
dp[n][1 << n] = 0
for bit in range(n2):
    done = [i for i in range(n + 1) if bit >> i & 1]
    todo = [i for i in range(n + 1) if ~bit >> i & 1]
    for v in done:
        dpi = dp[v][bit]
        if dpi == oo:
            continue
        for nv in todo:
            ndpi = next_time(v, dpi, nv)
            nbit = bit | 1 << nv
            dp[nv][nbit] = min(dp[nv][nbit], ndpi)

ans = min(dp[v][-1] for v in range(n))
print(f"{ans:.20f}")