Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:05 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 3820 rows and 0 columns
Presolve time: 0.19s
Presolved: 28156 rows, 31416 columns, 117856 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 5.356064e+04, 4733 iterations, 0.62 seconds

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

     0     0 53560.6389    0    3          - 53560.6389     -      -    0s
H    0     0                    54399.000000 53560.6389  1.54%     -    0s
H    0     0                    54071.000000 53560.6389  0.94%     -    0s
H    0     0                    54034.000000 53560.6389  0.88%     -    1s
     0     0 53562.2666    0    4 54034.0000 53562.2666  0.87%     -    1s
     0     0 53562.2666    0    3 54034.0000 53562.2666  0.87%     -    2s
     0     0 53562.2666    0    4 54034.0000 53562.2666  0.87%     -    2s
     0     0 53562.2666    0    4 54034.0000 53562.2666  0.87%     -    2s
     0     0 53562.2666    0    4 54034.0000 53562.2666  0.87%     -    3s
     0     2 53577.8095    0    4 54034.0000 53577.8095  0.84%     -    3s
H    3     3                    53958.534884 53694.1648  0.49%  75.3    3s
H    5     3                    53896.942857 53768.6383  0.24%   118    3s
H    6     4                    53851.918919 53768.6383  0.15%   100    3s
H    8     3                    53832.315789 53768.6383  0.12%  85.8    3s
*    9     3               6    53799.000000 53768.6383  0.06%  78.1    3s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 15 nodes (8137 simplex iterations) in 3.93 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.379900000000e+04, best bound 5.379900000000e+04, gap 0.0%