Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:29:36 2013

Optimize a model with 34336 rows, 33756 columns and 134676 nonzeros
Presolve removed 58 rows and 0 columns
Presolve time: 0.15s
Presolved: 34278 rows, 33756 columns, 134618 nonzeros
Variable types: 33698 continuous, 58 integer (58 binary)

Root relaxation: objective 4.816753e+04, 3959 iterations, 1.17 seconds

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

     0     0 48167.5345    0   47          - 48167.5345     -      -    1s
H    0     0                    69676.000000 48167.5345  30.9%     -    2s
     0     0 53501.7820    0    9 69676.0000 53501.7820  23.2%     -    4s
H    0     0                    61774.487974 53501.7820  13.4%     -    4s
H    0     0                    59429.000000 53501.7820  10.0%     -    4s
     0     0 54251.2339    0    6 59429.0000 54251.2339  8.71%     -    5s
     0     0 54605.9701    0    2 59429.0000 54605.9701  8.12%     -    5s
H    0     0                    55112.813239 54605.9701  0.92%     -    5s
H    0     0                    54996.000000 54605.9701  0.71%     -    5s
     0     2 54607.8376    0    2 54996.0000 54607.8376  0.71%     -    6s
H    5     3                    54847.000000 54659.9412  0.34%   140    6s
*    9     3               6    54818.000000 54659.9412  0.29%   225    7s
*   14     3               6    54807.000000 54727.9910  0.14%   190    7s

Cutting planes:
  Implied bound: 53

Explored 18 nodes (10453 simplex iterations) in 7.68 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.480700000000e+04, best bound 5.480661538462e+04, gap 0.0007%