Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:00:43 2013

Optimize a model with 18144 rows, 17724 columns and 70644 nonzeros
Presolve removed 42 rows and 0 columns
Presolve time: 0.08s
Presolved: 18102 rows, 17724 columns, 70602 nonzeros
Variable types: 17682 continuous, 42 integer (42 binary)

Root relaxation: objective 4.587660e+04, 2868 iterations, 0.55 seconds

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

     0     0 45876.5998    0   33          - 45876.5998     -      -    0s
H    0     0                    53366.000000 45876.5998  14.0%     -    0s
     0     0 51235.9036    0    5 53366.0000 51235.9036  3.99%     -    1s
H    0     0                    52900.887974 51235.9036  3.15%     -    1s
H    0     0                    51866.000000 51235.9036  1.21%     -    1s
H    0     0                    51465.000000 51235.9036  0.45%     -    1s
     0     0 51268.6939    0    5 51465.0000 51268.6939  0.38%     -    1s
     0     0 51269.0965    0    4 51465.0000 51269.0965  0.38%     -    1s
     0     2 51277.0682    0    4 51465.0000 51277.0682  0.37%     -    2s
*    6     4               5    51437.000000 51366.9629  0.14%  55.0    2s
*   12     3               8    51415.000000 51366.9629  0.09%  78.3    2s

Cutting planes:
  Gomory: 1
  Implied bound: 31

Explored 15 nodes (5126 simplex iterations) in 2.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.141500000000e+04, best bound 5.141456148602e+04, gap 0.0009%