import math
a, b, c, d, e, f = map(int, input().split())
# a(x+c/2a)^2 + b(y+d/2b)^2 = a*(c/2a)^2 + b*(d/2b)^2 - e + f

r = math.sqrt(a*(c/(2*a))**2 + b*(d/(2*b))**2 - e + f)
print(r)