Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:36 2012

Optimize a model with 1635 rows, 1620 columns and 5908 nonzeros
Presolve removed 158 rows and 50 columns
Presolve time: 0.02s
Presolved: 1477 rows, 1570 columns, 5563 nonzeros
Variable types: 1397 continuous, 173 integer (173 binary)

Root relaxation: objective 5.596833e+04, 247 iterations, 0.00 seconds

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

     0     0 55968.3316    0    3          - 55968.3316     -      -    0s
H    0     0                    56379.000000 55968.3316  0.73%     -    0s
H    0     0                    55997.000000 55968.3316  0.05%     -    0s
     0     0 55989.1940    0    4 55997.0000 55989.1940  0.01%     -    0s
     0     0 55989.1940    0    3 55997.0000 55989.1940  0.01%     -    0s
     0     0 55989.1940    0    4 55997.0000 55989.1940  0.01%     -    0s
     0     0 55991.5213    0    6 55997.0000 55991.5213  0.01%     -    0s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 0 nodes (399 simplex iterations) in 0.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.599700000000e+04, best bound 5.599152130028e+04, gap 0.0098%