function n = p15_n ( )

%*****************************************************************************80
%
%% p15_n returns the number of variables for problem 15.
%
%  Discussion:
%
%    The number of variables may be any multiple of 4.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    16 March 2000
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    integer N.  If N is positive, N represents the
%    only legal value for N for this problem.  If N is
%    negative, the absolute value of N is the least legal
%    value of N, but other values are allowable.
%
  n = - 4;

  return
end
