Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:14:56 2012

Optimize a model with 13796 rows, 4032 columns and 45106 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.38s
Presolved: 13857 rows, 4030 columns, 48637 nonzeros
Variable types: 0 continuous, 4030 integer (4030 binary)
Found heuristic solution: objective 63.0000000

Root relaxation: objective 2.000000e+00, 2814 iterations, 0.10 seconds

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

     0     0    2.00000    0  126   63.00000    2.00000  96.8%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    3.00000    0 1303    5.00000    3.00000  40.0%     -    2s
     0     0    3.00826    0 3139    5.00000    3.00826  39.8%     -    3s
     0     0    3.00826    0 3121    5.00000    3.00826  39.8%     -    5s
     0     0    3.00826    0 2619    5.00000    3.00826  39.8%     -   18s
     0     2    3.50000    0 2619    5.00000    3.50000  30.0%     -   26s
*   19     1              15       4.0000000    4.00000   0.0%  1292   29s

Cutting planes:
  Clique: 51
  Zero half: 1

Explored 20 nodes (82192 simplex iterations) in 29.23 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%