Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:37:05 2012

Optimize a model with 833 rows, 181 columns and 1666 nonzeros
Presolve removed 187 rows and 2 columns
Presolve time: 0.00s
Presolved: 646 rows, 179 columns, 1406 nonzeros
Variable types: 0 continuous, 179 integer (179 binary)
Found heuristic solution: objective 54.0000000

Root relaxation: objective 7.237500e+01, 375 iterations, 0.01 seconds

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

     0     0   72.37500    0  145   54.00000   72.37500  34.0%     -    0s
     0     0   71.57672    0  176   54.00000   71.57672  32.5%     -    0s
H    0     0                      56.0000000   71.57672  27.8%     -    0s
     0     0   70.88889    0  175   56.00000   70.88889  26.6%     -    0s
H    0     0                      57.0000000   70.88889  24.4%     -    0s
     0     0   70.08666    0  178   57.00000   70.08666  23.0%     -    0s
     0     0   69.60066    0  179   57.00000   69.60066  22.1%     -    0s
     0     0   69.39843    0  175   57.00000   69.39843  21.8%     -    0s
     0     0   69.32479    0  176   57.00000   69.32479  21.6%     -    0s
     0     0   69.00256    0  179   57.00000   69.00256  21.1%     -    0s
     0     0   68.74173    0  178   57.00000   68.74173  20.6%     -    0s
     0     0   68.58496    0  179   57.00000   68.58496  20.3%     -    0s
     0     0   68.48945    0  178   57.00000   68.48945  20.2%     -    0s
     0     0   68.36185    0  179   57.00000   68.36185  19.9%     -    0s
     0     0   68.20177    0  178   57.00000   68.20177  19.7%     -    0s
     0     0   68.05299    0  178   57.00000   68.05299  19.4%     -    0s
     0     0   67.96433    0  179   57.00000   67.96433  19.2%     -    0s
     0     0   67.94333    0  179   57.00000   67.94333  19.2%     -    0s
     0     0   67.94333    0  179   57.00000   67.94333  19.2%     -    0s
     0     2   67.93787    0  178   57.00000   67.93787  19.2%     -    0s
H  137    63                      59.0000000   66.80127  13.2%  60.3    0s
H  525   149                      60.0000000   65.38784  8.98%  53.5    1s
   710   188   64.93919   13  179   60.00000   65.03165  8.39%  50.5    5s
   719   194   63.21429   11  177   60.00000   65.03165  8.39%  49.9   10s
  2067   469   61.93548   23  131   60.00000   63.75627  6.26%  52.8   15s
  3730   430   61.15517   24  137   60.00000   62.48134  4.14%  47.1   20s

Cutting planes:
  Gomory: 2
  Clique: 2
  Zero half: 194
  Mod-K: 1

Explored 4665 nodes (209363 simplex iterations) in 22.17 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%