Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:02:37 2013

Optimize a model with 19888 rows, 19448 columns and 77528 nonzeros
Presolve removed 44 rows and 0 columns
Presolve time: 0.08s
Presolved: 19844 rows, 19448 columns, 77484 nonzeros
Variable types: 19404 continuous, 44 integer (44 binary)

Root relaxation: objective 4.429638e+04, 3250 iterations, 0.87 seconds

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

     0     0 44296.3772    0   33          - 44296.3772     -      -    1s
H    0     0                    58131.000000 44296.3772  23.8%     -    1s
     0     0 54484.4367    0    4 58131.0000 54484.4367  6.27%     -    2s
H    0     0                    57037.510534 54484.4367  4.48%     -    2s
H    0     0                    56518.000000 54484.4367  3.60%     -    2s
H    0     0                    55185.000000 54484.4367  1.27%     -    2s
     0     0 54847.5996    0    3 55185.0000 54847.5996  0.61%     -    2s
     0     0 54938.9081    0    4 55185.0000 54938.9081  0.45%     -    3s
     0     0 54968.2333    0    2 55185.0000 54968.2333  0.39%     -    3s
H    0     0                    55149.650000 54968.2333  0.33%     -    3s
H    0     0                    55069.000000 54968.2333  0.18%     -    3s
H    0     0                    54995.000000 54968.2333  0.05%     -    3s
     0     0 54968.2333    0   29 54995.0000 54968.2333  0.05%     -    4s
     0     0 54968.2333    0    2 54995.0000 54968.2333  0.05%     -    5s
     0     0 54968.6000    0    1 54995.0000 54968.6000  0.05%     -    5s
     0     2 54969.5517    0    1 54995.0000 54969.5517  0.05%     -    5s

Cutting planes:
  Gomory: 3
  Implied bound: 29

Explored 2 nodes (10465 simplex iterations) in 5.73 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.499500000000e+04, best bound 5.498978571429e+04, gap 0.0095%