Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:13:51 2013

Optimize a model with 27612 rows, 27092 columns and 108212 nonzeros
Presolve removed 2079 rows and 0 columns
Presolve time: 0.15s
Presolved: 25533 rows, 27092 columns, 104054 nonzeros
Variable types: 27040 continuous, 52 integer (52 binary)

Root relaxation: objective 5.466058e+04, 5144 iterations, 0.59 seconds

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

     0     0 54660.5771    0    4          - 54660.5771     -      -    0s
H    0     0                    56097.000000 54660.5771  2.56%     -    0s
     0     0 54664.9988    0    7 56097.0000 54664.9988  2.55%     -    1s
     0     0 54664.9988    0    7 56097.0000 54664.9988  2.55%     -    1s
H    0     0                    55087.000000 54664.9988  0.77%     -    1s
     0     2 54731.6955    0    4 55087.0000 54731.6955  0.64%     -    2s
H   13    10                    55030.179104 54738.7730  0.53%  91.2    2s
*   14     8              12    55006.000000 54738.7730  0.49%  87.0    2s
*   23     6               7    54971.000000 54760.7766  0.38%  83.9    3s
H   27     5                    54911.000000 54815.5778  0.17%  78.5    3s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 37 nodes (7958 simplex iterations) in 3.40 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.491100000000e+04, best bound 5.491100000000e+04, gap 0.0%