import math
import itertools
N,W = map(int,input().split())
X=[];Y=[];R=[];V=[];A=[]
for _ in range(N):
    x,y,r,v,a = map(int,input().split())
    X.append(x);Y.append(y);R.append(r);V.append(v);A.append(a)
#print(X,Y)
def touch(p,q,t,i): #今(p,q)に時間tでいてi番目の寿司を手に入れるのにかかる時間と最後の座標
    x = X[i]; y = Y[i]; r = R[i]; v = V[i]; a = A[i]
    sx = x + r*math.cos(math.radians(v*t+a))
    sy = y + r*math.sin(math.radians(v*t+a))
    if (p,q) == (sx,sy):
        return p,q,t
    ng = 0
    ok = 1000
    E = pow(10,-10)
    while abs(ok-ng) > E:
        mid = (ok+ng)/2
        mx = x + r*math.cos(math.radians(v*(t+mid)+a))
        my = y + r*math.sin(math.radians(v*(t+mid)+a))
        dis2 = pow(mx-p,2) + pow(my-q,2)
        if dis2 <= (mid*W)**2:
            ok = mid
        else:
            ng = mid
    nt = t + ok
    np = x + r*math.cos(math.radians(v*nt+a))
    nq =  y + r*math.sin(math.radians(v*nt+a))
    return np, nq, nt

B = [i for i in range(N)]
Order = list(itertools.permutations(B,N))
ans = 1<<60
for L in Order:
    x0 = 0; y0 = 0; t = 0 #原点スタート
    for i in L:
        x0, y0, t = touch(x0,y0,t,i)
    #print(t,X)
    ans = min(ans,t)

print(ans)