Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:16 2013

Optimize a model with 428 rows, 444 columns and 1682 nonzeros
Presolve removed 400 rows and 402 columns
Presolve time: 0.01s
Presolved: 28 rows, 42 columns, 120 nonzeros
Variable types: 30 continuous, 12 integer (12 binary)

Root relaxation: objective 4.440467e+03, 16 iterations, 0.00 seconds

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

     0     0 4440.46714    0    1          - 4440.46714     -      -    0s
H    0     0                    4458.9422153 4440.46714  0.41%     -    0s
     0     0 4446.78799    0    1 4458.94222 4446.78799  0.27%     -    0s
     0     0     cutoff    0      4458.94222 4458.94222   0.0%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 3

Explored 0 nodes (27 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458942215307e+03, best bound 4.458942215307e+03, gap 0.0%