Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:40 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2080 rows and 2080 columns
Presolve time: 0.28s
Presolved: 1948 rows, 1964 columns, 5870 nonzeros
Variable types: 993 continuous, 971 integer (971 binary)

Root relaxation: objective 3.881594e+03, 784 iterations, 0.02 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                    3893.9001900 3881.59364  0.32%     -    0s
     0     0 3881.86365    0    1 3893.90019 3881.86365  0.31%     -    0s
     0     0 3881.86365    0    1 3893.90019 3881.86365  0.31%     -    0s
     0     0 3881.86365    0    1 3893.90019 3881.86365  0.31%     -    0s
     0     0 3881.98465    0    1 3893.90019 3881.98465  0.31%     -    0s
     0     0 3882.08714    0    1 3893.90019 3882.08714  0.30%     -    0s
     0     0     cutoff    0      3893.90019 3893.90019   0.0%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 6

Explored 0 nodes (910 simplex iterations) in 0.36 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893900189955e+03, best bound 3.893900189955e+03, gap 0.0%