function exact = p18_exact ( )

%*****************************************************************************80
%
%% P18_EXACT returns the exact integral for problem 18.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    28 December 2011
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real EXACT, the value of the integral.
%
  beta = 1.0;

  exact = 2.0^( 3.0 * beta + 1.0 );

  return
end
