Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:16:46 2013

Optimize a model with 28726 rows, 28196 columns and 112466 nonzeros
Presolve removed 53 rows and 0 columns
Presolve time: 0.12s
Presolved: 28673 rows, 28196 columns, 112413 nonzeros
Variable types: 28143 continuous, 53 integer (53 binary)

Root relaxation: objective 4.291879e+04, 3302 iterations, 1.25 seconds

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

     0     0 42918.7878    0   45          - 42918.7878     -      -    1s
H    0     0                    60726.000000 42918.7878  29.3%     -    2s
     0     0 55525.9374    0    5 60726.0000 55525.9374  8.56%     -    4s
H    0     0                    60166.984305 55525.9374  7.71%     -    4s
H    0     0                    57405.000000 55525.9374  3.27%     -    4s
     0     0 56067.8308    0    3 57405.0000 56067.8308  2.33%     -    4s
H    0     0                    56072.000000 56067.8308  0.01%     -    4s

Cutting planes:
  Implied bound: 45

Explored 0 nodes (6046 simplex iterations) in 4.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.607200000000e+04, best bound 5.606783076598e+04, gap 0.0074%