Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:30:08 2012

Optimize a model with 834 rows, 179 columns and 1668 nonzeros
Presolve removed 171 rows and 0 columns
Presolve time: 0.01s
Presolved: 663 rows, 179 columns, 1439 nonzeros
Variable types: 0 continuous, 179 integer (179 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 7.300000e+01, 327 iterations, 0.01 seconds

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

     0     0   73.00000    0  142   51.00000   73.00000  43.1%     -    0s
     0     0   71.64516    0  178   51.00000   71.64516  40.5%     -    0s
     0     0   70.19231    0  177   51.00000   70.19231  37.6%     -    0s
     0     0   69.45104    0  177   51.00000   69.45104  36.2%     -    0s
     0     0   68.95312    0  179   51.00000   68.95312  35.2%     -    0s
     0     0   68.55629    0  178   51.00000   68.55629  34.4%     -    0s
     0     0   68.20944    0  179   51.00000   68.20944  33.7%     -    0s
     0     0   67.77635    0  177   51.00000   67.77635  32.9%     -    0s
     0     0   67.64004    0  179   51.00000   67.64004  32.6%     -    0s
     0     0   67.43422    0  179   51.00000   67.43422  32.2%     -    0s
     0     0   67.27807    0  179   51.00000   67.27807  31.9%     -    0s
     0     0   67.17502    0  178   51.00000   67.17502  31.7%     -    0s
H    0     0                      52.0000000   67.17502  29.2%     -    0s
     0     0   67.01990    0  179   52.00000   67.01990  28.9%     -    0s
     0     0   66.97355    0  179   52.00000   66.97355  28.8%     -    0s
     0     0   66.97355    0  179   52.00000   66.97355  28.8%     -    0s
H    0     0                      55.0000000   66.97355  21.8%     -    0s
     0     2   66.97351    0  178   55.00000   66.97351  21.8%     -    0s
H   55    25                      57.0000000   66.88949  17.3%  45.6    0s
   611   281   61.11217   19  177   57.00000   64.41050  13.0%  46.4    5s
  1986   815   58.50000   37  112   57.00000   63.45729  11.3%  45.3   10s
  5112  2046   58.69231   30  130   57.00000   62.10000  8.95%  37.6   15s
  8896  2885   59.14286   31  124   57.00000   61.21429  7.39%  33.8   20s
 13526  3476     cutoff   32        57.00000   60.50000  6.14%  31.2   25s
 18890  3534   58.82143   28  118   57.00000   59.92857  5.14%  29.3   30s
 25170  2381     cutoff   40        57.00000   59.16667  3.80%  28.0   35s

Cutting planes:
  Gomory: 4
  Zero half: 84

Explored 29816 nodes (799300 simplex iterations) in 38.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%