def volume a, b, c, d, e, f
  x0 = (-d + b + c)*( d + b + c)
  x1 = ( d - b + c)*( d + b - c)
  y0 = ( a - e + c)*( a + e + c)
  y1 = ( a + e - c)*(-a + e + c)
  z0 = ( a + b - f)*( a + b + f)
  z1 = (-a + b + f)*( a - b + f)
  s = Math.sqrt(x1 * y0 * z0)
  t = Math.sqrt(x0 * y1 * z0)
  u = Math.sqrt(x0 * y0 * z1)
  v = Math.sqrt(x1 * y1 * z1)
  Math.sqrt((-s + t + u + v)*( s - t + u + v)*( s + t - u + v)*( s + t + u - v))/(192*a*b*c)
end
 
while gets
  args = $_.split.map &:to_f
  puts <<~EOS % [*args, volume(*args)]
    lengths of edges: %.8f %.8f %.8f %.8f %.8f %.8f
    volume\t\t\t: %.16f
    -------------------------------------
  EOS
end
 

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