case 4: // Tim 2
                inst_args.n_regions = 6;
                inst_args.n_delivery_points = 10;
                inst_args.n_hubs = 6;
                inst_args.timesteps = 7;
                break;

            default:
                inst_args.container_capacity = 52;
                inst_args.vehicle_capacity = 18;
                inst_args.timesteps = 8;
                inst_args.sorting_steps = 3;
                inst_args.n_regions = 2;
                inst_args.n_delivery_points = 3;
                inst_args.n_hubs = 8;
                inst_args.max_delivery_point_degree = 60;
                inst_args.max_center_dp_degree = 10;