Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:52:52 2012

Optimize a model with 161 rows, 97 columns and 497 nonzeros
Presolve time: 0.00s
Presolved: 161 rows, 97 columns, 497 nonzeros
Variable types: 0 continuous, 97 integer (97 binary)
Found heuristic solution: objective 40.0000000

Root relaxation: objective 0.000000e+00, 23 iterations, 0.00 seconds

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

     0     0    0.00000    0   17   40.00000    0.00000   100%     -    0s
     0     0    0.52941    0   18   40.00000    0.52941  98.7%     -    0s
     0     0    1.07563    0   19   40.00000    1.07563  97.3%     -    0s
     0     0    1.39305    0   20   40.00000    1.39305  96.5%     -    0s
     0     0    1.51557    0   21   40.00000    1.51557  96.2%     -    0s
     0     0    1.52941    0   21   40.00000    1.52941  96.2%     -    0s
     0     0    1.53072    0   23   40.00000    1.53072  96.2%     -    0s
H    0     0                      38.0000000    1.53072  96.0%     -    0s
     0     2    1.57932    0   23   38.00000    1.57932  95.8%     -    0s
H   81    50                      36.0000000   13.50389  62.5%  18.2    0s
H  121    51                      33.0000000   13.89062  57.9%  16.0    0s
*  137    53              11      32.0000000   14.59375  54.4%  15.6    0s
*  456    37               9      31.0000000   22.78125  26.5%  11.9    0s

Cutting planes:
  Gomory: 4
  Mod-K: 4

Explored 558 nodes (6411 simplex iterations) in 0.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%