# AMPL Model by Hande Y. Benson
#
# Copyright (C) 2001 Princeton University
# All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose and without fee is hereby
# granted, provided that the above copyright notice appear in all
# copies and that the copyright notice and this
# permission notice appear in all supporting documentation.                     

#   classification QBR2-AN-V-0

param N:=250000;
var x{1..N} >= 0.1, <= 10.0, := 0.5;

minimize f:
	sum {i in 1..N} 0.5*i*(x[i]+x[((2*i-1) mod N)+1]+x[((3*i-1) mod N)+1])^2;