Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:17 2013

Optimize a model with 428 rows, 444 columns and 1682 nonzeros
Presolve removed 398 rows and 398 columns
Presolve time: 0.01s
Presolved: 30 rows, 46 columns, 131 nonzeros
Variable types: 33 continuous, 13 integer (13 binary)

Root relaxation: objective 3.881594e+03, 18 iterations, 0.00 seconds

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

     0     0 3881.59364    0    1          - 3881.59364     -      -    0s
H    0     0                    3893.8994555 3881.59364  0.32%     -    0s
     0     0 3881.86365    0    1 3893.89946 3881.86365  0.31%     -    0s
     0     0     cutoff    0      3893.89946 3893.89946   0.0%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 3

Explored 0 nodes (25 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893899455475e+03, best bound 3.893899455475e+03, gap 0.0%