set VEG := VEG1 VEG2;      # vegetable oils
set OIL := OIL1 OIL2 OIL3; # non-vegetable oils

param SELL_PRICE := 150;

param T := 6; # number of months

param HARDNESS :=
   VEG1  8.8
   VEG2  6.1
   OIL1  2.0
   OIL2  4.2
   OIL3  5.0;

param HARD_LOW := 3;
param HARD_HIGH := 6;

param INV_COST := 5;

param COST:  1   2   3   4   5   6 :=
      VEG1 110 130 110 120 100  90
      VEG2 120 130 140 110 120 100
      OIL1 130 110 130 120 150 140
      OIL2 110  90 100 120 110  80
      OIL3 115 115  95 125 105 135;

param STORE_LIMIT := 1000;

param INIT_INV := 500;

param FINAL_INV := 500;

param Ref_Veg_limit := 200;

param Ref_Oil_limit := 250;