Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:27 2013

Optimize a model with 20745 rows, 20295 columns and 81045 nonzeros
Presolve removed 2169 rows and 0 columns
Presolve time: 0.11s
Presolved: 18576 rows, 20295 columns, 76707 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 5.562103e+04, 3335 iterations, 0.25 seconds

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

     0     0 55621.0327    0    3          - 55621.0327     -      -    0s
H    0     0                    56147.000000 55621.0327  0.94%     -    0s
     0     0 55624.6658    0    3 56147.0000 55624.6658  0.93%     -    0s
     0     2 55627.9659    0    3 56147.0000 55627.9659  0.92%     -    0s
H    1     1                    55822.333333 55627.9659  0.35%   0.0    0s
H    2     2                    55775.000000 55699.3673  0.14%   130    0s
H    6     4                    55743.800000 55699.3673  0.08%  68.0    1s
*    7     2               6    55721.000000 55699.3673  0.04%  61.9    1s

Cutting planes:
  Gomory: 1

Explored 9 nodes (3840 simplex iterations) in 1.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.572100000000e+04, best bound 5.571756250000e+04, gap 0.0062%