Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:01:11 2013

Optimize a model with 4525 rows, 900 columns and 13950 nonzeros
Presolve removed 562 rows and 455 columns
Presolve time: 0.04s
Presolved: 3963 rows, 445 columns, 12267 nonzeros
Variable types: 14 continuous, 431 integer (431 binary)
Found heuristic solution: objective 21543.000000

Root relaxation: objective 1.543053e+04, 2280 iterations, 0.06 seconds

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

     0     0 15430.5333    0    9 21543.0000 15430.5333  28.4%     -    0s
H    0     0                    15477.000000 15430.5333  0.30%     -    0s
H    0     0                    15459.000000 15430.5333  0.18%     -    0s
H    0     0                    15445.000000 15430.5333  0.09%     -    0s
     0     0 15431.0000    0   24 15445.0000 15431.0000  0.09%     -    0s
     0     0 15431.0000    0   13 15445.0000 15431.0000  0.09%     -    0s
     0     0 15431.0198    0   29 15445.0000 15431.0198  0.09%     -    0s
     0     1 15431.0211    0   29 15445.0000 15431.0211  0.09%     -    0s
H   38    11                    15442.000000 15434.7850  0.05%  16.9    0s

Cutting planes:
  Gomory: 11
  Cover: 3
  Implied bound: 2
  MIR: 29
  Zero half: 3

Explored 128 nodes (4076 simplex iterations) in 0.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.544200000000e+04, best bound 1.544100000000e+04, gap 0.0065%