Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:47:52 2012

Optimize a model with 846 rows, 184 columns and 1692 nonzeros
Presolve removed 206 rows and 2 columns
Presolve time: 0.00s
Presolved: 640 rows, 182 columns, 1414 nonzeros
Variable types: 0 continuous, 182 integer (182 binary)
Found heuristic solution: objective 53.0000000

Root relaxation: objective 7.425000e+01, 316 iterations, 0.01 seconds

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

     0     0   74.25000    0  147   53.00000   74.25000  40.1%     -    0s
     0     0   73.15929    0  181   53.00000   73.15929  38.0%     -    0s
H    0     0                      54.0000000   73.15929  35.5%     -    0s
     0     0   72.26414    0  181   54.00000   72.26414  33.8%     -    0s
     0     0   71.25982    0  182   54.00000   71.25982  32.0%     -    0s
     0     0   70.77628    0  179   54.00000   70.77628  31.1%     -    0s
     0     0   70.35369    0  180   54.00000   70.35369  30.3%     -    0s
H    0     0                      55.0000000   70.35369  27.9%     -    0s
     0     0   70.04298    0  180   55.00000   70.04298  27.4%     -    0s
     0     0   69.95394    0  180   55.00000   69.95394  27.2%     -    0s
H    0     0                      57.0000000   69.95394  22.7%     -    0s
     0     0   69.83117    0  180   57.00000   69.83117  22.5%     -    0s
     0     0   69.70143    0  180   57.00000   69.70143  22.3%     -    0s
     0     0   69.60568    0  180   57.00000   69.60568  22.1%     -    0s
     0     0   69.50335    0  180   57.00000   69.50335  21.9%     -    0s
     0     0   69.40830    0  181   57.00000   69.40830  21.8%     -    0s
     0     0   69.36655    0  182   57.00000   69.36655  21.7%     -    0s
     0     0   69.32245    0  181   57.00000   69.32245  21.6%     -    0s
     0     0   69.28366    0  182   57.00000   69.28366  21.6%     -    0s
     0     0   69.28366    0  181   57.00000   69.28366  21.6%     -    0s
     0     2   69.28238    0  180   57.00000   69.28238  21.5%     -    0s
H   14    14                      58.0000000   69.19457  19.3%  94.0    0s
*   15    15              10      59.0000000   69.19457  17.3%  88.5    0s
H   69    34                      61.0000000   68.80633  12.8%  68.7    0s
   611   200   63.56908    9  181   61.00000   66.45552  8.94%  55.1    5s
  2393   598   63.64000   27  140   61.00000   64.90197  6.40%  47.0   10s
  5343   609   62.57500   23  139   61.00000   63.50000  4.10%  39.5   15s

Cutting planes:
  Gomory: 4
  Zero half: 78

Explored 7130 nodes (259206 simplex iterations) in 17.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0%