Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:17:31 2012

Optimize a model with 6750 rows, 2550 columns and 22600 nonzeros
Presolve removed 1500 rows and 0 columns
Presolve time: 0.15s
Presolved: 5250 rows, 2550 columns, 19500 nonzeros
Variable types: 0 continuous, 2550 integer (2550 binary)
Found heuristic solution: objective 29.0000000

Root relaxation: objective 3.000000e+00, 11987 iterations, 2.09 seconds

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

     0     0    3.00000    0  118   29.00000    3.00000  89.7%     -    2s
H    0     0                       6.0000000    3.00000  50.0%     -    2s
H    0     0                       5.0000000    3.00000  40.0%     -    3s
     0     0    3.00000    0  275    5.00000    3.00000  40.0%     -    3s
     0     0    3.00000    0  157    5.00000    3.00000  40.0%     -    5s
     0     0    3.00000    0  165    5.00000    3.00000  40.0%     -    7s
H    0     0                       4.0000000    3.00000  25.0%     -    8s
     0     0    3.00000    0  203    4.00000    3.00000  25.0%     -   10s
     0     0    3.00000    0  203    4.00000    3.00000  25.0%     -   10s
     0     2    3.00000    0  164    4.00000    3.00000  25.0%     -   12s
     4     4    3.00000    1  116    4.00000    3.00000  25.0%  1410   16s
     6     6    3.00000    1  157    4.00000    3.00000  25.0%   940   22s
     7     6    3.00000    1  154    4.00000    3.00000  25.0%   805   25s
    10     8    3.00000    1  157    4.00000    3.00000  25.0%   564   31s
    12    10    3.00000    1  157    4.00000    3.00000  25.0%   470   39s

Cutting planes:
  Gomory: 4
  Zero half: 1

Explored 12 nodes (177267 simplex iterations) in 39.10 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%