forretal08lc <- function(x, A=0.5, B=10, C=-5)
{
  ##########################################################################
  #
  # FORRESTER ET AL. (2008) FUNCTION, LOWER FIDELITY CODE
  # Calls: forretal08.r
  # This function is used as the "low-accuracy code" version of the function
  # forretal08.r.
  #
  # Authors: Sonja Surjanovic, Simon Fraser University
  #          Derek Bingham, Simon Fraser University
  # Questions/Comments: Please email Derek Bingham at dbingham@stat.sfu.ca.
  #
  # Copyright 2013. Derek Bingham, Simon Fraser University.
  #
  # THERE IS NO WARRANTY, EXPRESS OR IMPLIED. WE DO NOT ASSUME ANY LIABILITY
  # FOR THE USE OF THIS SOFTWARE.  If software is modified to produce
  # derivative works, such modified software should be clearly marked.
  # Additionally, this program is free software; you can redistribute it 
  # and/or modify it under the terms of the GNU General Public License as 
  # published by the Free Software Foundation; version 2.0 of the License. 
  # Accordingly, this program is distributed in the hope that it will be 
  # useful, but WITHOUT ANY WARRANTY; without even the implied warranty 
  # of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
  # General Public License for more details.
  #
  # For function details and reference information, see:
  # http://www.sfu.ca/~ssurjano/
  #
  ##########################################################################
  #
  # INPUTS:
  #
  # x = scalar
  # A = constant (optional), with default value 0.5
  # B = constant (optional), with default value 10
  # C = constant (optional), with default value -5
  #
  ##########################################################################
  
  source('forretal08.r')
  yh <- forretal08(x)
  
  term1 <- A * yh
  term2 <- B * (x-0.5)
  
  y <- term1 + term2 - C
  return(y)
}