from math import sin, cos, pi, hypot
N, W = map(int, input().split())
XYRVA = [list(map(int, input().split())) for _ in range(N)]
def calc_dist(px, py, t_start, idx_sushi):
    x, y, r, v, a = XYRVA[idx_sushi]

    # 届かないような最大の時間
    ok = 0.0
    ng = 1e5
    for _ in range(60):
        c = (ok + ng) * 0.5
        t = t_start + c
        rad = (v*t+a)*pi/180.0
        qx = x + r * cos(rad)
        qy = y + r * sin(rad)
        d_sushi = hypot(qx-px, qy-py)
        d_lunlun = c * W
        if d_lunlun <= d_sushi:
            ok = c
        else:
            ng = c
    return t_start+ok, qx, qy


inf = 1e9
Pxy = [[(inf, 0.0, 0.0) for _ in range(N)] for _ in range(1<<N)]
for sushi in range(N):
    t, x, y = calc_dist(0.0, 0.0, 0.0, sushi)
    Pxy[1<<sushi][sushi] = t, x, y

# a = calc_dist(2, 0, 1, 0)
# print(a)
for s in range(1<<N):
    for sushi1 in range(N):
        if s >> sushi1 & 1 == 0:
            continue
        for sushi2 in range(N):
            if s >> sushi2 & 1:
                continue

            t_start, px, py = Pxy[s][sushi1]
            t_goal, qx, qy = calc_dist(px, py, t_start, sushi2)
            if t_goal < Pxy[s|1<<sushi2][sushi2][0]:
                Pxy[s|1<<sushi2][sushi2] = t_goal, qx, qy

# import numpy as np
# print(np.array(Pxy))
ans = min(t for t, _, _ in Pxy[(1<<N)-1])
print(ans)