Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:23:28 2012

Optimize a model with 782 rows, 178 columns and 1564 nonzeros
Presolve removed 175 rows and 2 columns
Presolve time: 0.00s
Presolved: 607 rows, 176 columns, 1323 nonzeros
Variable types: 0 continuous, 176 integer (176 binary)
Found heuristic solution: objective 52.0000000

Root relaxation: objective 7.250000e+01, 333 iterations, 0.01 seconds

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

     0     0   72.50000    0  139   52.00000   72.50000  39.4%     -    0s
     0     0   70.86096    0  175   52.00000   70.86096  36.3%     -    0s
H    0     0                      53.0000000   70.86096  33.7%     -    0s
     0     0   70.18687    0  175   53.00000   70.18687  32.4%     -    0s
H    0     0                      56.0000000   70.18687  25.3%     -    0s
     0     0   69.71306    0  176   56.00000   69.71306  24.5%     -    0s
     0     0   69.28692    0  175   56.00000   69.28692  23.7%     -    0s
     0     0   68.98943    0  174   56.00000   68.98943  23.2%     -    0s
     0     0   68.93416    0  175   56.00000   68.93416  23.1%     -    0s
     0     0   68.77199    0  176   56.00000   68.77199  22.8%     -    0s
     0     0   68.61838    0  176   56.00000   68.61838  22.5%     -    0s
     0     0   68.44106    0  175   56.00000   68.44106  22.2%     -    0s
     0     0   68.36894    0  176   56.00000   68.36894  22.1%     -    0s
     0     0   68.24517    0  175   56.00000   68.24517  21.9%     -    0s
     0     0   68.21655    0  175   56.00000   68.21655  21.8%     -    0s
     0     0   68.21655    0  175   56.00000   68.21655  21.8%     -    0s
     0     2   68.21468    0  175   56.00000   68.21468  21.8%     -    0s
H   63    42                      57.0000000   67.63156  18.7%  61.4    0s
H  379   176                      58.0000000   65.70149  13.3%  49.1    0s
   609   280   59.42857   10  174   58.00000   65.05000  12.2%  45.3    5s
   836   378   62.91279   24  137   58.00000   65.05000  12.2%  53.8   10s
  2970  1166   60.90000   32  128   58.00000   63.28571  9.11%  41.2   15s
  5825  1968     cutoff   36        58.00000   62.27778  7.38%  35.8   20s
  8897  2300   59.48485   33  129   58.00000   61.54255  6.11%  33.0   25s
 12771  2170     cutoff   35        58.00000   60.86957  4.95%  31.1   30s
 15097  1840   59.00000   45  130   58.00000   60.46154  4.24%  30.1   35s

Cutting planes:
  Gomory: 3
  Zero half: 206

Explored 19437 nodes (548272 simplex iterations) in 38.96 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%