Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:26 2012

Optimize a model with 514 rows, 140 columns and 1028 nonzeros
Presolve removed 137 rows and 4 columns
Presolve time: 0.00s
Presolved: 377 rows, 136 columns, 831 nonzeros
Variable types: 0 continuous, 136 integer (136 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.776562e+01, 269 iterations, 0.00 seconds

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

     0     0   57.76562    0  130   45.00000   57.76562  28.4%     -    0s
H    0     0                      50.0000000   57.76562  15.5%     -    0s
H    0     0                      52.0000000   57.76562  11.1%     -    0s
     0     0   56.68056    0  130   52.00000   56.68056  9.00%     -    0s
     0     0   55.67123    0  129   52.00000   55.67123  7.06%     -    0s
     0     0   55.34733    0  127   52.00000   55.34733  6.44%     -    0s
     0     0   55.26699    0  127   52.00000   55.26699  6.28%     -    0s
     0     0   55.03731    0  125   52.00000   55.03731  5.84%     -    0s
     0     0   54.84286    0  128   52.00000   54.84286  5.47%     -    0s
     0     0   54.84211    0  129   52.00000   54.84211  5.47%     -    0s
     0     0   54.84211    0  127   52.00000   54.84211  5.47%     -    0s
H    0     0                      53.0000000   54.84211  3.48%     -    0s
     0     2   54.84211    0  127   53.00000   54.84211  3.48%     -    0s

Cutting planes:
  Zero half: 29

Explored 21 nodes (1295 simplex iterations) in 0.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%