$*************************************************************
$ Small planning problem
$
$ G.R. Kocis and I.E. Grossmann, "Relaxation Strategy for the
$   Structural Optimization of Process Flow Sheets", Ind. Eng.
$   Chem. Res., 1987, 26 (9), 1869.
$
$ Optimal Soluion:  -1.923
$*************************************************************

DECLARATION {{
  XVAR {x0,x1,x2,x3,x4,x5,x6,x7};
  YVAR {y0,y1,y2};
  BINARY {y0,y1,y2};
  XUBD {-,-,-,-,-,5,-,1};
  XLBD {0,0,0,0,0,0,0,0};
  YSTP {0,1,0};
}}

MODEL {{
  MIN: 3.5*y0 + y1 + 1.5*y2 + 7.0*x4 + x5 + 1.2*x6 + 1.8*x0 - 11*x7 ;
  n1:  x5 - log[x1 + 1] =e= 0 ;
  n2:  x6 - 1.2*log[x2 + 1] =e= 0 ;
  l3:  x7 - 0.9*x3 =e= 0;
  l4:  x4 + x5 + x6 - x3 =e= 0 ;
  l5:  x0 - x1 - x2 =e= 0 ;
  l6:  x3 - 5*y0 =l= 0 ;
  l7:  x1 - 5*y1 =l= 0 ;
  l8:  x2 - 5*y2 =l= 0 ;
}}