Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:44 2012

Optimize a model with 469 rows, 133 columns and 938 nonzeros
Presolve removed 92 rows and 0 columns
Presolve time: 0.00s
Presolved: 377 rows, 133 columns, 812 nonzeros
Variable types: 0 continuous, 133 integer (133 binary)
Found heuristic solution: objective 42.0000000

Root relaxation: objective 5.600000e+01, 188 iterations, 0.00 seconds

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

     0     0   56.00000    0  108   42.00000   56.00000  33.3%     -    0s
     0     0   54.00000    0  131   42.00000   54.00000  28.6%     -    0s
H    0     0                      43.0000000   54.00000  25.6%     -    0s
     0     0   53.18860    0  130   43.00000   53.18860  23.7%     -    0s
H    0     0                      44.0000000   53.18860  20.9%     -    0s
     0     0   52.42038    0  130   44.00000   52.42038  19.1%     -    0s
     0     0   52.18430    0  131   44.00000   52.18430  18.6%     -    0s
     0     0   52.05605    0  131   44.00000   52.05605  18.3%     -    0s
     0     0   51.90664    0  129   44.00000   51.90664  18.0%     -    0s
H    0     0                      45.0000000   51.90664  15.3%     -    0s
     0     0   51.80000    0  128   45.00000   51.80000  15.1%     -    0s
     0     0   51.78571    0  129   45.00000   51.78571  15.1%     -    0s
     0     0   51.78571    0  128   45.00000   51.78571  15.1%     -    0s
     0     2   51.78571    0  127   45.00000   51.78571  15.1%     -    0s
*   20    15              14      46.0000000   51.78571  12.6%  27.9    0s
H 1059    48                      47.0000000   48.55556  3.31%  27.4    3s

Cutting planes:
  Gomory: 3
  Zero half: 141

Explored 1120 nodes (30953 simplex iterations) in 3.98 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%