Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:16:04 2013

Optimize a model with 28673 rows, 28143 columns and 112413 nonzeros
Presolve removed 4188 rows and 0 columns
Presolve time: 0.16s
Presolved: 24485 rows, 28143 columns, 104037 nonzeros
Variable types: 28090 continuous, 53 integer (53 binary)

Root relaxation: objective 5.539924e+04, 4486 iterations, 0.43 seconds

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

     0     0 55399.2438    0    4          - 55399.2438     -      -    0s
H    0     0                    55975.000000 55399.2438  1.03%     -    0s
H    0     0                    55406.000000 55399.2438  0.01%     -    0s
     0     0     cutoff    0      55406.0000 55406.0000   0.0%     -    0s

Cutting planes:
  Flow cover: 3

Explored 0 nodes (4523 simplex iterations) in 0.88 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.540600000000e+04, best bound 5.540600000000e+04, gap 0.0%