Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:03:16 2012

Optimize a model with 719 rows, 171 columns and 1438 nonzeros
Presolve removed 147 rows and 0 columns
Presolve time: 0.00s
Presolved: 572 rows, 171 columns, 1245 nonzeros
Variable types: 0 continuous, 171 integer (171 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 6.925000e+01, 332 iterations, 0.01 seconds

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

     0     0   69.25000    0  141   51.00000   69.25000  35.8%     -    0s
     0     0   67.52806    0  168   51.00000   67.52806  32.4%     -    0s
H    0     0                      53.0000000   67.52806  27.4%     -    0s
     0     0   66.70497    0  167   53.00000   66.70497  25.9%     -    0s
H    0     0                      55.0000000   66.70497  21.3%     -    0s
     0     0   66.27655    0  168   55.00000   66.27655  20.5%     -    0s
     0     0   65.76502    0  170   55.00000   65.76502  19.6%     -    0s
     0     0   65.49149    0  168   55.00000   65.49149  19.1%     -    0s
     0     0   65.30765    0  169   55.00000   65.30765  18.7%     -    0s
     0     0   65.04331    0  170   55.00000   65.04331  18.3%     -    0s
     0     0   64.81891    0  168   55.00000   64.81891  17.9%     -    0s
     0     0   64.69995    0  170   55.00000   64.69995  17.6%     -    0s
     0     0   64.60671    0  170   55.00000   64.60671  17.5%     -    0s
     0     0   64.54613    0  170   55.00000   64.54613  17.4%     -    0s
     0     0   64.33360    0  170   55.00000   64.33360  17.0%     -    0s
     0     0   64.18259    0  169   55.00000   64.18259  16.7%     -    0s
     0     0   64.11260    0  169   55.00000   64.11260  16.6%     -    0s
     0     0   64.10259    0  169   55.00000   64.10259  16.6%     -    0s
     0     0   64.10259    0  169   55.00000   64.10259  16.6%     -    0s
     0     2   64.09861    0  169   55.00000   64.09861  16.5%     -    0s
H  103    48                      56.0000000   63.17308  12.8%  52.1    0s
H  110    40                      57.0000000   63.17308  10.8%  49.5    0s
*  169    48              20      58.0000000   63.04260  8.69%  46.4    0s
   612   121   60.75641    5  168   58.00000   61.39981  5.86%  44.8    5s

Cutting planes:
  Gomory: 7
  Zero half: 78
  Mod-K: 1

Explored 1725 nodes (69103 simplex iterations) in 7.23 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.800000000000e+01, best bound 5.800000000000e+01, gap 0.0%