Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:55:51 2013

Optimize a model with 720 rows, 4860 columns and 10900 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.03s
Presolved: 700 rows, 4840 columns, 10480 nonzeros
Variable types: 4440 continuous, 400 integer (400 binary)

Root relaxation: objective 3.894400e+04, 468 iterations, 0.01 seconds

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

     0     0 38944.0027    0    4          - 38944.0027     -      -    0s
     0     0 39036.0915    0    4          - 39036.0915     -      -    0s
     0     0 39047.8104    0    4          - 39047.8104     -      -    0s
     0     0 39047.8104    0    4          - 39047.8104     -      -    0s
H    0     0                    39396.401490 39047.8104  0.88%     -    0s
     0     2 39047.8104    0    4 39396.4015 39047.8104  0.88%     -    0s
*   19     1              15    39246.875698 39246.8757   0.0%  14.7    0s

Cutting planes:
  Gomory: 1
  Implied bound: 8
  Flow cover: 2

Explored 20 nodes (991 simplex iterations) in 0.20 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924687569829e+04, best bound 3.924687569829e+04, gap 0.0%