Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:31:59 2012

Optimize a model with 71 rows, 53 columns and 142 nonzeros
Presolve removed 47 rows and 33 columns
Presolve time: 0.00s
Presolved: 24 rows, 20 columns, 48 nonzeros
Variable types: 0 continuous, 20 integer (20 binary)
Found heuristic solution: objective 27.0000000

Root relaxation: objective 2.800000e+01, 20 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

*    0     0               0      28.0000000   28.00000   0.0%     -    0s

Explored 0 nodes (20 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%