Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:05:21 2013

Optimize a model with 21712 rows, 21252 columns and 84732 nonzeros
Presolve removed 46 rows and 0 columns
Presolve time: 0.09s
Presolved: 21666 rows, 21252 columns, 84686 nonzeros
Variable types: 21206 continuous, 46 integer (46 binary)

Root relaxation: objective 4.757840e+04, 4218 iterations, 1.18 seconds

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

     0     0 47578.3969    0   36          - 47578.3969     -      -    1s
H    0     0                    60743.000000 47578.3969  21.7%     -    1s
     0     0 54953.5792    0    8 60743.0000 54953.5792  9.53%     -    3s
H    0     0                    56801.000000 54953.5792  3.25%     -    3s
     0     0 55117.6914    0    5 56801.0000 55117.6914  2.96%     -    3s
     0     0 55162.5773    0    3 56801.0000 55162.5773  2.88%     -    3s
H    0     0                    56304.000000 55162.5773  2.03%     -    3s
H    0     0                    55231.000000 55162.5773  0.12%     -    3s
     0     0 55210.7376    0    3 55231.0000 55210.7376  0.04%     -    3s
     0     0 55210.9651    0    2 55231.0000 55210.9651  0.04%     -    3s
     0     0 55210.9651    0   35 55231.0000 55210.9651  0.04%     -    5s
     0     0 55210.9651    0    5 55231.0000 55210.9651  0.04%     -    6s
     0     0 55210.9651    0    2 55231.0000 55210.9651  0.04%     -    7s
     0     0     cutoff    0      55231.0000 55231.0000   0.0%     -    7s

Cutting planes:
  Gomory: 3
  Implied bound: 36

Explored 0 nodes (13280 simplex iterations) in 7.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.523100000000e+04, best bound 5.523100000000e+04, gap 0.0%