Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:13:45 2012

Optimize a model with 3042 rows, 1560 columns and 10530 nonzeros
Presolve removed 468 rows and 0 columns
Presolve time: 0.06s
Presolved: 2574 rows, 1560 columns, 9516 nonzeros
Variable types: 0 continuous, 1560 integer (1560 binary)
Found heuristic solution: objective 21.0000000

Root relaxation: objective 3.000000e+00, 2697 iterations, 0.12 seconds

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

     0     0    3.00000    0   34   21.00000    3.00000  85.7%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0  106    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   40    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   59    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   60    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   69    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   82    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   82    4.00000    3.00000  25.0%     -    2s
     0     2    3.00000    0   56    4.00000    3.00000  25.0%     -    2s
     9     8    3.00000    1   64    4.00000    3.00000  25.0%   503    5s

Cutting planes:
  Gomory: 5
  Zero half: 2

Explored 10 nodes (68399 simplex iterations) in 5.88 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%