Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:59:23 2013

Optimize a model with 39773 rows, 3844 columns and 121086 nonzeros
Presolve removed 2972 rows and 1935 columns
Presolve time: 0.32s
Presolved: 36801 rows, 1909 columns, 112525 nonzeros
Variable types: 36 continuous, 1873 integer (1873 binary)
Found heuristic solution: objective 74335.000000

Root relaxation: objective 4.884856e+04, 24931 iterations, 2.23 seconds

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

     0     0 48848.5577    0   13 74335.0000 48848.5577  34.3%     -    2s
H    0     0                    48874.000000 48848.5577  0.05%     -    2s
H    0     0                    48866.000000 48848.5577  0.04%     -    2s
H    0     0                    48859.000000 48848.5577  0.02%     -    2s
     0     0 48848.8794    0   46 48859.0000 48848.8794  0.02%     -    2s
     0     0 48848.8794    0   14 48859.0000 48848.8794  0.02%     -    3s
     0     0 48848.8794    0   51 48859.0000 48848.8794  0.02%     -    3s
     0     2 48848.9630    0   51 48859.0000 48848.9630  0.02%     -    3s
H    1     2                    48857.000000 48848.9630  0.02%   0.0    3s
H   12     9                    48856.000000 48851.0010  0.01%   0.0    4s

Cutting planes:
  Gomory: 6
  Implied bound: 1
  MIR: 29
  Zero half: 9

Explored 16 nodes (28945 simplex iterations) in 4.27 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.885600000000e+04, best bound 4.885200000000e+04, gap 0.0082%