Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:06:53 2013

Optimize a model with 22654 rows, 22184 columns and 88454 nonzeros
Presolve removed 47 rows and 0 columns
Presolve time: 0.10s
Presolved: 22607 rows, 22184 columns, 88407 nonzeros
Variable types: 22137 continuous, 47 integer (47 binary)

Root relaxation: objective 4.248878e+04, 3440 iterations, 1.22 seconds

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

     0     0 42488.7772    0   41          - 42488.7772     -      -    1s
H    0     0                    57509.000000 42488.7772  26.1%     -    2s
     0     0 50411.8443    0    7 57509.0000 50411.8443  12.3%     -    3s
H    0     0                    55897.888773 50411.8443  9.81%     -    3s
H    0     0                    53324.000000 50411.8443  5.46%     -    3s
     0     0 50710.8292    0    2 53324.0000 50710.8292  4.90%     -    3s
H    0     0                    51415.031482 50710.8292  1.37%     -    3s
H    0     0                    51137.000000 50710.8292  0.83%     -    3s
     0     2 50727.1545    0    2 51137.0000 50727.1545  0.80%     -    4s
*    6     4               5    50983.000000 50942.9340  0.08%   145    4s

Cutting planes:
  Implied bound: 43

Explored 13 nodes (6935 simplex iterations) in 4.59 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.098300000000e+04, best bound 5.098300000000e+04, gap 0.0%