import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
import math
def sub(x,y,t,i,ii=None):
    xi,yi,r,v,a = l[i]
    theta = (v*t + a) * math.pi / 180
    w = v*math.pi/180
    ll = 0
    rr = 10**9
    for _ in range(50):
        mm = (ll+rr)/2
        v1 = W**2 * mm**2
        v2 = ((xi + r*math.cos(theta+mm*w) - x) ** 2 + (yi + r*math.sin(theta+mm*w) - y) ** 2)
        if v1<v2:
            ll = mm
        else:
            rr = mm
#     print(mm)
    return (((xi + r*math.cos(theta+mm*w) - x) ** 2 + (yi + r*math.sin(theta+mm*w) - y) ** 2)) ** 0.5 / W
def loc(i,t):
    xi,yi,r,v,a = l[i]
    th = (v*t+a)*math.pi/180
    return xi + r*math.cos(th), yi+r*math.sin(th)
n,W = list(map(int, input().split()))
l = []
for i in range(n):
    l.append(list(map(int, input().split())))
inf = float("inf")
dp = [[inf]*(1<<(n)) for _ in range(n)]
for i in range(n):
    dp[i][1<<i] = sub(0,0,0,i)
def chmin(j,b,val):
    dp[j][b] = min(dp[j][b], val)
for b in range(1<<n):
    for i in range(n):
        if dp[i][b]==inf:
            continue
        for j in range(n):
            if b>>j&1:
                continue
            xx,yy = loc(i,dp[i][b])
            chmin(j, b|(1<<j), dp[i][b]+sub(xx,yy,dp[i][b],j))
ans = min(dp[i][(1<<n)-1] for i in range(n))
print(ans)