Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:10:14 2012

Optimize a model with 6124 rows, 2450 columns and 20578 nonzeros
Presolve removed 1522 rows and 51 columns
Presolve time: 0.15s
Presolved: 4602 rows, 2399 columns, 16862 nonzeros
Variable types: 0 continuous, 2399 integer (2399 binary)
Found heuristic solution: objective 49.0000000

Root relaxation: objective 3.000000e+00, 4420 iterations, 0.58 seconds

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

     0     0    3.00000    0 1172   49.00000    3.00000  93.9%     -    1s
H    0     0                      39.0000000    3.00000  92.3%     -    1s
H    0     0                      34.0000000    3.00000  91.2%     -    1s
     0     0    3.00000    0  124   34.00000    3.00000  91.2%     -    2s
H    0     0                      31.0000000    3.00000  90.3%     -    2s
H    0     0                       5.0000000    3.00000  40.0%     -    2s
     0     0    3.00000    0  120    5.00000    3.00000  40.0%     -    2s
H    0     0                       4.0000000    3.00000  25.0%     -    2s
     0     0    3.00000    0  128    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    5s
     0     0 infeasible    0         4.00000    3.00001  25.0%     -    5s

Cutting planes:
  Gomory: 1
  Zero half: 32

Explored 0 nodes (28691 simplex iterations) in 5.61 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%