Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:17:06 2013

Optimize a model with 28726 rows, 28196 columns and 112466 nonzeros
Presolve removed 53 rows and 0 columns
Presolve time: 0.12s
Presolved: 28673 rows, 28196 columns, 112413 nonzeros
Variable types: 28143 continuous, 53 integer (53 binary)

Root relaxation: objective 4.569863e+04, 3943 iterations, 1.79 seconds

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

     0     0 45698.6297    0   48          - 45698.6297     -      -    2s
H    0     0                    63990.000000 45698.6297  28.6%     -    3s
     0     0 56075.2698    0    4 63990.0000 56075.2698  12.4%     -    5s
H    0     0                    60173.425736 56075.2698  6.81%     -    5s
H    0     0                    59460.000000 56075.2698  5.69%     -    5s
H    0     0                    56980.000000 56075.2698  1.59%     -    5s
     0     0 56753.1077    0    2 56980.0000 56753.1077  0.40%     -    5s
H    0     0                    56831.000000 56753.1077  0.14%     -    5s
     0     0 56803.1565    0    1 56831.0000 56803.1565  0.05%     -    6s
     0     0     cutoff    0      56831.0000 56831.0000   0.0%     -    6s

Cutting planes:
  Implied bound: 47

Explored 0 nodes (6921 simplex iterations) in 6.12 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.683100000000e+04, best bound 5.683100000000e+04, gap 0.0%