Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:52:44 2012

Optimize a model with 930 rows, 185 columns and 1860 nonzeros
Presolve removed 213 rows and 0 columns
Presolve time: 0.01s
Presolved: 717 rows, 185 columns, 1579 nonzeros
Variable types: 0 continuous, 185 integer (185 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 7.200000e+01, 414 iterations, 0.01 seconds

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

     0     0   72.00000    0  140   48.00000   72.00000  50.0%     -    0s
H    0     0                      51.0000000   72.00000  41.2%     -    0s
     0     0   71.20000    0  179   51.00000   71.20000  39.6%     -    0s
H    0     0                      52.0000000   71.20000  36.9%     -    0s
     0     0   70.37321    0  184   52.00000   70.37321  35.3%     -    0s
     0     0   69.55690    0  182   52.00000   69.55690  33.8%     -    0s
     0     0   68.99022    0  183   52.00000   68.99022  32.7%     -    0s
     0     0   68.68325    0  183   52.00000   68.68325  32.1%     -    0s
     0     0   68.51562    0  184   52.00000   68.51562  31.8%     -    0s
     0     0   68.40094    0  183   52.00000   68.40094  31.5%     -    0s
     0     0   68.25268    0  183   52.00000   68.25268  31.3%     -    0s
     0     0   68.20559    0  184   52.00000   68.20559  31.2%     -    0s
     0     0   68.13752    0  184   52.00000   68.13752  31.0%     -    0s
     0     0   68.12203    0  184   52.00000   68.12203  31.0%     -    0s
     0     0   68.12203    0  184   52.00000   68.12203  31.0%     -    0s
     0     2   68.12169    0  184   52.00000   68.12169  31.0%     -    0s
H   21    21                      53.0000000   68.12169  28.5%  59.5    0s
H   27    27                      54.0000000   68.12169  26.2%  48.5    0s
H   43    28                      57.0000000   68.05552  19.4%  58.2    0s
*  413   219              23      58.0000000   65.89854  13.6%  51.6    1s
   611   322   60.40000   23  183   58.00000   65.36235  12.7%  49.1    5s
  1975   834   59.00000   37  112   58.00000   64.36576  11.0%  48.1   10s
  4846  1979   62.00000   35  148   58.00000   62.87755  8.41%  39.0   15s
  8720  2977   59.93143   27  126   58.00000   62.00000  6.90%  34.5   20s
 12993  3595   59.50000   25   91   58.00000   61.38182  5.83%  31.8   25s
 18225  3635     cutoff   34        58.00000   60.87500  4.96%  29.9   30s
*18850  2190              30      59.0000000   60.80000  3.05%  29.7   30s

Cutting planes:
  Gomory: 1
  Zero half: 74

Explored 21592 nodes (607345 simplex iterations) in 33.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%