Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:02:24 2013

Optimize a model with 484 rows, 19404 columns and 38764 nonzeros
Presolve time: 0.03s
Presolved: 484 rows, 19404 columns, 38764 nonzeros
Variable types: 19360 continuous, 44 integer (44 binary)

Root relaxation: objective 5.481494e+04, 1176 iterations, 0.02 seconds

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

     0     0 54814.9354    0    5          - 54814.9354     -      -    0s
H    0     0                    55520.000000 54814.9354  1.27%     -    0s
H    0     0                    55003.000000 54814.9354  0.34%     -    0s
     0     0 54962.4952    0    3 55003.0000 54962.4952  0.07%     -    0s
     0     0 54967.2857    0    3 55003.0000 54967.2857  0.06%     -    0s
     0     0 54967.2857    0    5 55003.0000 54967.2857  0.06%     -    0s
     0     0 54967.2857    0    3 55003.0000 54967.2857  0.06%     -    0s
     0     0 54967.2857    0    3 55003.0000 54967.2857  0.06%     -    0s
     0     0 54968.2333    0    2 55003.0000 54968.2333  0.06%     -    0s
     0     0 54968.2333    0    2 55003.0000 54968.2333  0.06%     -    0s
     0     0 54968.6000    0    1 55003.0000 54968.6000  0.06%     -    0s
H    0     0                    54995.000000 54968.6000  0.05%     -    0s
     0     2 54980.5931    0    1 54995.0000 54980.5931  0.03%     -    0s

Cutting planes:
  Implied bound: 16
  Flow cover: 4

Explored 3 nodes (2141 simplex iterations) in 0.40 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.499500000000e+04, best bound 5.499385714286e+04, gap 0.0021%