MOdel:
min=900-300*x1-200*x2-240*x3-210*x4-350*x5-250*x6-200*x7-400*x8-200*x9;
900-300*x1-200*x2-240*x3-210*x4-350*x5-250*x6-200*x7-400*x8-200*x9=0;
x1<=2;
x2<=2;
x3<=2;
x4<=2;
x5<=2;
x6<=2;
x7<=2;
x8<=2;
x9<=2;
@gin(x1);
@gin(x2);
@gin(x3);
@gin(x4);
@gin(x5);
@gin(x6);
@gin(x7);
@gin(x8);
@gin(x9);
end