Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:25 2012

Optimize a model with 552 rows, 151 columns and 1104 nonzeros
Presolve removed 90 rows and 4 columns
Presolve time: 0.00s
Presolved: 462 rows, 147 columns, 972 nonzeros
Variable types: 0 continuous, 147 integer (147 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 6.600000e+01, 181 iterations, 0.00 seconds

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

     0     0   66.00000    0  122   51.00000   66.00000  29.4%     -    0s
     0     0   64.12500    0  135   51.00000   64.12500  25.7%     -    0s
     0     0   63.50595    0  145   51.00000   63.50595  24.5%     -    0s
H    0     0                      52.0000000   63.50595  22.1%     -    0s
H    0     0                      53.0000000   63.50595  19.8%     -    0s
     0     0   62.50794    0  145   53.00000   62.50794  17.9%     -    0s
     0     0   61.48134    0  144   53.00000   61.48134  16.0%     -    0s
     0     0   61.07074    0  146   53.00000   61.07074  15.2%     -    0s
     0     0   60.73864    0  147   53.00000   60.73864  14.6%     -    0s
     0     0   60.64906    0  146   53.00000   60.64906  14.4%     -    0s
     0     0   60.54729    0  146   53.00000   60.54729  14.2%     -    0s
     0     0   60.52235    0  147   53.00000   60.52235  14.2%     -    0s
     0     0   60.52235    0  144   53.00000   60.52235  14.2%     -    0s
H    0     0                      54.0000000   60.52235  12.1%     -    0s
     0     2   60.51870    0  144   54.00000   60.51870  12.1%     -    0s
*    9     9               6      56.0000000   60.51395  8.06%  57.2    0s

Cutting planes:
  Zero half: 133

Explored 168 nodes (7486 simplex iterations) in 0.33 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%