Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:28:11 2012

Optimize a model with 16519 rows, 4970 columns and 54178 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.56s
Presolved: 16517 rows, 4968 columns, 53706 nonzeros
Variable types: 0 continuous, 4968 integer (4968 binary)
Found heuristic solution: objective 70.0000000

Root relaxation: objective 2.000000e+00, 3549 iterations, 0.13 seconds

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

     0     0    2.00000    0  140   70.00000    2.00000  97.1%     -    0s
H    0     0                      67.0000000    2.00000  97.0%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0  128    5.00000    3.00000  40.0%     -    6s
     0     0    3.00741    0 3417    5.00000    3.00741  39.9%     -    9s
     0     0    3.00741    0 3474    5.00000    3.00741  39.9%     -   12s
     0     0    3.00741    0 3460    5.00000    3.00741  39.9%     -   18s
     0     0    3.00741    0 3447    5.00000    3.00741  39.9%     -   25s
     0     0    3.00741    0 3450    5.00000    3.00741  39.9%     -   32s
     0     0    3.00741    0 3450    5.00000    3.00741  39.9%     -   39s
     0     2    3.50000    0 3450    5.00000    3.50000  30.0%     -   58s
     2     2    4.00000    1  138    5.00000    4.00000  20.0% 12020   60s
*   23     3              18       4.0000000    4.00000   0.0%  1400   61s

Cutting planes:
  Clique: 40
  Zero half: 6

Explored 24 nodes (152423 simplex iterations) in 61.01 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%