Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:01:31 2013

Optimize a model with 47971 rows, 4356 columns and 145926 nonzeros
Presolve removed 3754 rows and 2207 columns
Presolve time: 0.37s
Presolved: 44217 rows, 2149 columns, 134474 nonzeros
Variable types: 29 continuous, 2120 integer (2120 binary)
Found heuristic solution: objective 78379.000000

Root relaxation: objective 5.668280e+04, 13023 iterations, 1.12 seconds

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

     0     0 56682.7955    0   12 78379.0000 56682.7955  27.7%     -    1s
H    0     0                    56697.000000 56682.7955  0.03%     -    1s
H    0     0                    56691.000000 56682.7955  0.01%     -    1s
     0     0 56683.2681    0   30 56691.0000 56683.2681  0.01%     -    1s
     0     0 56683.2681    0   14 56691.0000 56683.2681  0.01%     -    2s
     0     0 56683.3892    0   33 56691.0000 56683.3892  0.01%     -    2s
H    0     0                    56688.000000 56683.3892  0.01%     -    2s

Cutting planes:
  Gomory: 3
  MIR: 5
  Zero half: 1

Explored 0 nodes (15163 simplex iterations) in 2.28 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.668800000000e+04, best bound 5.668400000000e+04, gap 0.0071%