Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:21:13 2013

Optimize a model with 30910 rows, 30360 columns and 121110 nonzeros
Presolve removed 55 rows and 0 columns
Presolve time: 0.13s
Presolved: 30855 rows, 30360 columns, 121055 nonzeros
Variable types: 30305 continuous, 55 integer (55 binary)

Root relaxation: objective 4.750844e+04, 3907 iterations, 1.51 seconds

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

     0     0 47508.4370    0   43          - 47508.4370     -      -    1s
H    0     0                    62240.000000 47508.4370  23.7%     -    2s
     0     0 56284.1259    0   15 62240.0000 56284.1259  9.57%     -    4s
H    0     0                    60667.000000 56284.1259  7.22%     -    4s
     0     0 56576.8089    0    7 60667.0000 56576.8089  6.74%     -    4s
H    0     0                    58116.369238 56576.8089  2.65%     -    4s
H    0     0                    57267.000000 56576.8089  1.21%     -    4s
H    0     0                    57241.000000 56576.8089  1.16%     -    4s
     0     2 56577.6854    0    7 57241.0000 56577.6854  1.16%     -    5s
H    6     6                    57011.461538 56692.5958  0.56%   120    6s
H    8     5                    56834.055088 56700.6804  0.23%   115    6s
H   14    10                    56828.666667 56700.6804  0.23%  96.0    6s
*   15     8              12    56770.000000 56700.6804  0.12%  98.3    6s
*   17     6              10    56765.000000 56700.6804  0.11%  88.1    6s

Cutting planes:
  Gomory: 1
  Implied bound: 50

Explored 40 nodes (9138 simplex iterations) in 7.12 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.676500000000e+04, best bound 5.676027012008e+04, gap 0.0083%