Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:39:06 2012

Optimize a model with 820 rows, 182 columns and 1640 nonzeros
Presolve removed 201 rows and 0 columns
Presolve time: 0.01s
Presolved: 619 rows, 182 columns, 1380 nonzeros
Variable types: 0 continuous, 182 integer (182 binary)
Found heuristic solution: objective 53.0000000

Root relaxation: objective 7.158333e+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   71.58333    0  175   53.00000   71.58333  35.1%     -    0s
H    0     0                      56.0000000   71.58333  27.8%     -    0s
     0     0   70.61221    0  176   56.00000   70.61221  26.1%     -    0s
     0     0   69.96683    0  179   56.00000   69.96683  24.9%     -    0s
     0     0   69.70701    0  180   56.00000   69.70701  24.5%     -    0s
     0     0   69.34878    0  181   56.00000   69.34878  23.8%     -    0s
     0     0   68.95664    0  182   56.00000   68.95664  23.1%     -    0s
     0     0   68.83593    0  182   56.00000   68.83593  22.9%     -    0s
     0     0   68.67522    0  181   56.00000   68.67522  22.6%     -    0s
     0     0   68.64912    0  182   56.00000   68.64912  22.6%     -    0s
     0     0   68.55124    0  181   56.00000   68.55124  22.4%     -    0s
     0     0   68.49057    0  181   56.00000   68.49057  22.3%     -    0s
     0     0   68.33312    0  180   56.00000   68.33312  22.0%     -    0s
     0     0   68.19144    0  180   56.00000   68.19144  21.8%     -    0s
     0     0   68.16030    0  182   56.00000   68.16030  21.7%     -    0s
     0     0   68.16030    0  182   56.00000   68.16030  21.7%     -    0s
H    0     0                      57.0000000   68.16030  19.6%     -    0s
     0     2   68.15749    0  180   57.00000   68.15749  19.6%     -    0s
*   19    19              15      58.0000000   68.15749  17.5%  68.8    0s
H   22    18                      59.0000000   68.15749  15.5%  59.6    0s
*   79    48              16      60.0000000   67.41843  12.4%  57.4    0s
*  116    49              18      61.0000000   66.87561  9.63%  55.0    0s
   611   156   64.00000   11  177   61.00000   64.93220  6.45%  48.0    5s

Cutting planes:
  Gomory: 2
  Zero half: 65
  Mod-K: 1

Explored 2412 nodes (101696 simplex iterations) in 9.88 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%