Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:38 2013

Optimize a model with 20790 rows, 20340 columns and 81090 nonzeros
Presolve removed 45 rows and 0 columns
Presolve time: 0.09s
Presolved: 20745 rows, 20340 columns, 81045 nonzeros
Variable types: 20295 continuous, 45 integer (45 binary)

Root relaxation: objective 4.417317e+04, 3979 iterations, 1.08 seconds

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

     0     0 44173.1747    0   35          - 44173.1747     -      -    1s
H    0     0                    58865.000000 44173.1747  25.0%     -    1s
     0     0 52431.5012    0   13 58865.0000 52431.5012  10.9%     -    3s
H    0     0                    54530.000000 52431.5012  3.85%     -    3s
     0     0 52618.4985    0    7 54530.0000 52618.4985  3.51%     -    3s
H    0     0                    53443.000000 52618.4985  1.54%     -    3s
     0     0 52618.9670    0    6 53443.0000 52618.9670  1.54%     -    3s
H    0     0                    53101.000000 52618.9670  0.91%     -    3s
     0     2 52619.2387    0    6 53101.0000 52619.2387  0.91%     -    4s
H    4     4                    52807.583109 52664.9731  0.27%  80.5    4s
*    7     2               6    52714.000000 52702.4359  0.02%  94.3    4s

Cutting planes:
  Implied bound: 40

Explored 10 nodes (7222 simplex iterations) in 4.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.271400000000e+04, best bound 5.271400000000e+04, gap 0.0%