Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:56:28 2013

Optimize a model with 7806 rows, 1296 columns and 23976 nonzeros
Presolve removed 952 rows and 658 columns
Presolve time: 0.06s
Presolved: 6854 rows, 638 columns, 21123 nonzeros
Variable types: 17 continuous, 621 integer (621 binary)
Found heuristic solution: objective 26897.000000

Root relaxation: objective 1.971900e+04, 2319 iterations, 0.08 seconds

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

     0     0 19719.0000    0   11 26897.0000 19719.0000  26.7%     -    0s
H    0     0                    19759.000000 19719.0000  0.20%     -    0s
H    0     0                    19738.000000 19719.0000  0.10%     -    0s
H    0     0                    19734.000000 19719.0000  0.08%     -    0s
     0     0 19719.0000    0   16 19734.0000 19719.0000  0.08%     -    0s
     0     0 19719.0000    0   11 19734.0000 19719.0000  0.08%     -    0s
     0     0 19719.0000    0   13 19734.0000 19719.0000  0.08%     -    0s
H    0     0                    19728.000000 19719.0000  0.05%     -    0s
     0     2 19719.0000    0   13 19728.0000 19719.0000  0.05%     -    0s
H  640   219                    19727.000000 19720.5755  0.03%  13.6    0s

Cutting planes:
  Gomory: 4
  Cover: 3
  Implied bound: 3
  MIR: 45
  Zero half: 11

Explored 2406 nodes (31047 simplex iterations) in 1.28 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.972700000000e+04, best bound 1.972600000000e+04, gap 0.0051%