Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:14:06 2013

Optimize a model with 27612 rows, 27092 columns and 108212 nonzeros
Presolve removed 3199 rows and 0 columns
Presolve time: 0.16s
Presolved: 24413 rows, 27092 columns, 101814 nonzeros
Variable types: 27040 continuous, 52 integer (52 binary)

Root relaxation: objective 4.736869e+04, 3286 iterations, 0.29 seconds

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

     0     0 47368.6932    0    2          - 47368.6932     -      -    0s
H    0     0                    47804.000000 47368.6932  0.91%     -    0s
     0     0 47368.8389    0    3 47804.0000 47368.8389  0.91%     -    0s
     0     2 47371.7461    0    3 47804.0000 47371.7461  0.90%     -    1s
H    1     1                    47777.978261 47371.7461  0.85%   0.0    1s
H    2     2                    47690.406780 47501.9746  0.40%   116    1s
*    3     3               3    47528.000000 47528.0000   0.0%   136    1s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 4 nodes (3701 simplex iterations) in 1.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.752800000000e+04, best bound 4.752800000000e+04, gap 0.0%