Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:45 2012

Optimize a model with 582 rows, 111 columns and 1164 nonzeros
Presolve removed 206 rows and 0 columns
Presolve time: 0.00s
Presolved: 376 rows, 111 columns, 925 nonzeros
Variable types: 0 continuous, 111 integer (111 binary)
Found heuristic solution: objective 26.0000000

Root relaxation: objective 3.954545e+01, 242 iterations, 0.00 seconds

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

     0     0   39.54545    0  105   26.00000   39.54545  52.1%     -    0s
H    0     0                      28.0000000   39.54545  41.2%     -    0s
     0     0   38.76562    0  105   28.00000   38.76562  38.4%     -    0s
H    0     0                      30.0000000   38.76562  29.2%     -    0s
     0     0   38.33295    0  110   30.00000   38.33295  27.8%     -    0s
     0     0   37.86786    0  110   30.00000   37.86786  26.2%     -    0s
     0     0   37.64819    0  109   30.00000   37.64819  25.5%     -    0s
     0     0   37.56873    0  110   30.00000   37.56873  25.2%     -    0s
     0     0   37.44001    0  110   30.00000   37.44001  24.8%     -    0s
     0     0   37.35592    0  111   30.00000   37.35592  24.5%     -    0s
     0     0   37.35434    0  111   30.00000   37.35434  24.5%     -    0s
     0     0   37.35434    0  110   30.00000   37.35434  24.5%     -    0s
     0     2   37.35013    0  110   30.00000   37.35013  24.5%     -    0s
*   17    11               9      31.0000000   37.35013  20.5%  39.2    0s

Cutting planes:
  Gomory: 5
  Clique: 1
  Zero half: 40

Explored 2528 nodes (50556 simplex iterations) in 4.59 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%