function value = flag_1_integral ( )

%*****************************************************************************80
%
%% flag_1_integral() returns the exact integral of a given integrand.
%
%  Discussion:
%
%    f(x) = x * exp(-x) / ( exp(x) - 1 ).
%
%    integral ( 0 <= x < +oo ) f(x) dx = ...
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    21 May 2014
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    real VALUE, the value of the integral.
%
  value = pi^2 / 6.0 - 1.0;

  return
end
