Gurobi 5.0.1 (linux64) logging started Sat Dec  8 10:24:46 2012

Optimize a model with 1635 rows, 1620 columns and 5890 nonzeros
Presolve removed 208 rows and 76 columns
Presolve time: 0.01s
Presolved: 1427 rows, 1544 columns, 5461 nonzeros
Variable types: 1373 continuous, 171 integer (171 binary)

Root relaxation: objective 5.777136e+04, 347 iterations, 0.01 seconds

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

     0     0 57771.3556    0   22          - 57771.3556     -      -    0s
H    0     0                    62778.000000 57771.3556  7.98%     -    0s
H    0     0                    59600.000000 57771.3556  3.07%     -    0s
     0     0 57790.1813    0   24 59600.0000 57790.1813  3.04%     -    0s
     0     0 57792.2417    0   30 59600.0000 57792.2417  3.03%     -    0s
     0     0 57792.3569    0   31 59600.0000 57792.3569  3.03%     -    0s
     0     0 57796.4639    0   32 59600.0000 57796.4639  3.03%     -    0s
     0     0 57796.5879    0   32 59600.0000 57796.5879  3.03%     -    0s
     0     2 57802.2589    0   32 59600.0000 57802.2589  3.02%     -    0s
H   54    51                    58752.000000 57871.4843  1.50%   9.6    0s
H  326   248                    58680.000000 57932.5329  1.27%  10.0    0s
H 1583   679                    58646.000000 58067.9431  0.99%  11.0    1s
  6689  2352 58553.3477   23   15 58646.0000 58281.3572  0.62%  10.1    5s
 15568  3673 58521.1702   20   17 58646.0000 58414.5391  0.39%   9.4   10s
 25414  1086 58609.8737   30   14 58646.0000 58578.4208  0.12%   8.8   15s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 26739 nodes (228805 simplex iterations) in 15.62 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.864600000000e+04, best bound 5.864033077266e+04, gap 0.0097%