Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:06 2012

Optimize a model with 226 rows, 90 columns and 452 nonzeros
Presolve removed 61 rows and 9 columns
Presolve time: 0.00s
Presolved: 165 rows, 81 columns, 345 nonzeros
Variable types: 0 continuous, 81 integer (81 binary)
Found heuristic solution: objective 34.0000000

Root relaxation: objective 4.050000e+01, 103 iterations, 0.00 seconds

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

     0     0   40.50000    0   67   34.00000   40.50000  19.1%     -    0s
     0     0   39.33333    0   75   34.00000   39.33333  15.7%     -    0s
H    0     0                      35.0000000   39.33333  12.4%     -    0s
     0     0   38.76471    0   74   35.00000   38.76471  10.8%     -    0s
H    0     0                      36.0000000   38.76471  7.68%     -    0s
     0     0   38.40000    0   77   36.00000   38.40000  6.67%     -    0s
     0     0   38.29630    0   77   36.00000   38.29630  6.38%     -    0s
     0     0   38.14286    0   79   36.00000   38.14286  5.95%     -    0s
     0     0   38.08333    0   78   36.00000   38.08333  5.79%     -    0s
     0     0   38.08333    0   74   36.00000   38.08333  5.79%     -    0s
     0     0   38.08333    0   78   36.00000   38.08333  5.79%     -    0s
     0     0   38.08333    0   71   36.00000   38.08333  5.79%     -    0s
     0     2   38.08333    0   71   36.00000   38.08333  5.79%     -    0s
*    9     4               6      37.0000000   38.08333  2.93%  11.4    0s

Cutting planes:
  Gomory: 1
  Zero half: 19

Explored 14 nodes (498 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.700000000000e+01, best bound 3.700000000000e+01, gap 0.0%