import math
from decimal import *
getcontext().prec = 200

def rot90(a): # 반시계
    return (-a[1], a[0])

def dot(a, b):
    return a[0] * b[0] + a[1] * b[1]

def cross(a, b):
    return a[0] * b[1] - a[1] * b[0]

def add(a, b):
    return (a[0] + b[0], a[1] + b[1])

def sub(a, b):
    return (a[0] - b[0], a[1] - b[1])

def mul(a, b): # a: 스칼라
    return (a * b[0], a * b[1])

def dist(a, b):
    t = sub(b, a)
    return dot(t, t).sqrt()
    

def is_facing(a, b, c, d):
    n0 = rot90(sub(a, b))
    n1 = rot90(sub(c, d))
    return (dot(n0, sub(c, a)) >= 0 and dot(n0, sub(d, a)) >= 0) and (dot(n1, sub(a, c)) >= 0 and dot(n1, sub(b, c)) >= 0)

def make_tri(a, b, h):
    norm = rot90(sub(b, a))
    sq = dot(norm, norm)
    k = (sq / 4 + h ** 2).sqrt()
    c = add(mul(k / sq.sqrt(), norm), mul(Decimal(0.5), add(a, b)))
    return (a, b, c)

def is_in(p, a, b, x):
    v0 = sub(a, p)
    v1 = sub(x, p)
    v2 = sub(b, p)
    
    return cross(v0, v1) >= 0 and cross(v1, v2) >= 0

ls = []
for i in range(2):
    ls.append([*map(Decimal, input().split())])
pyra = []
tmp = []
for l in ls:
    x = l[0]
    y = l[1]
    dx = l[2] - x
    dy = l[3] - y
    tmp = [(x, y), (x + dx, y + dy), (x + dx - dy, y + dy + dx), (x - dy, y + dx), l[4]]
    pyra.append(tmp)

mn = Decimal(1e9)

for i in range(4):
    for j in range(4):
        a = pyra[0][i % 4]
        b = pyra[0][(i + 1) % 4]
        c = pyra[1][j % 4]
        d = pyra[1][(j + 1) % 4]
        if is_facing(a, b, c, d):
            t0 = make_tri(a, b, pyra[0][4])
            t1 = make_tri(c, d, pyra[1][4])
            #print(t0, t1)

            a, b, c = t0
            d, e, f = t1

          
            # case work
            if is_in(c, a, b, f) and is_in(f, d, e, c):
                mn = min(mn, dist(c, f))
                #print('cf')

            if is_in(c, a, b, d):
                mn = min(mn, dist(c, d) + dist(d, f))
                #print('cdf')

            if is_in(c, a, b, e):
                mn = min(mn, dist(c, e) + dist(e, f))
                #print('cef')

            if is_in(f, d, e, a):
                mn = min(mn, dist(c, a) + dist(a, f))
                #print('caf')

            if is_in(f, d, e, b):
                mn = min(mn, dist(c, b) + dist(b, f))
                #print('cbf')

            mn = min(mn, dist(c, a) + dist(f, d) + min([dist(a, d), dist(a, e), dist(b, d), dist(b, e)]))

print(mn)