Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:26:18 2012

Optimize a model with 4816 rows, 1892 columns and 16168 nonzeros
Presolve removed 1419 rows and 0 columns
Presolve time: 0.10s
Presolved: 3397 rows, 1892 columns, 12857 nonzeros
Variable types: 0 continuous, 1892 integer (1892 binary)
Found heuristic solution: objective 30.0000000

Root relaxation: objective 3.000000e+00, 2985 iterations, 0.21 seconds

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

     0     0    3.00000    0   94   30.00000    3.00000  90.0%     -    0s
H    0     0                       5.0000000    3.00000  40.0%     -    0s
     0     0    3.00000    0  198    5.00000    3.00000  40.0%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0   89    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   97    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0  112    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0  114    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   95    4.00000    3.00000  25.0%     -    7s
     0     0    3.00000    0  120    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0  113    4.00000    3.00000  25.0%     -    8s
     0     2    3.00000    0   88    4.00000    3.00000  25.0%     -   10s
     7     6    3.00000    1  141    4.00000    3.00000  25.0%   775   15s
    10     8    3.00000    1   56    4.00000    3.00000  25.0%   543   20s
    15    12    3.00000   15   98    4.00000    3.00000  25.0%  5014   25s

Cutting planes:
  Zero half: 6

Explored 22 nodes (139093 simplex iterations) in 28.67 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%