Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:55:32 2012

Optimize a model with 239 rows, 142 columns and 737 nonzeros
Presolve time: 0.00s
Presolved: 239 rows, 142 columns, 737 nonzeros
Variable types: 0 continuous, 142 integer (142 binary)
Found heuristic solution: objective 60.0000000

Root relaxation: objective 0.000000e+00, 40 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   23   60.00000    0.00000   100%     -    0s
H    0     0                      58.0000000    0.00000   100%     -    0s
H    0     0                      56.0000000    0.00000   100%     -    0s
     0     0    0.89350    0   33   56.00000    0.89350  98.4%     -    0s
     0     0    0.96618    0   26   56.00000    0.96618  98.3%     -    0s
     0     0    0.96618    0   26   56.00000    0.96618  98.3%     -    0s
     0     0    0.96618    0   26   56.00000    0.96618  98.3%     -    0s
     0     0    0.96618    0   26   56.00000    0.96618  98.3%     -    0s
H    0     0                      54.0000000    0.96618  98.2%     -    0s
     0     2    1.44444    0   26   54.00000    1.44444  97.3%     -    0s
*   25    18              12      53.0000000    7.72222  85.4%  27.7    0s
*   52    33              15      51.0000000    7.72515  84.9%  24.9    0s
*  134    73              16      49.0000000   20.00000  59.2%  21.6    0s
*  179    84              14      48.0000000   20.22222  57.9%  19.8    0s
*  526   148              15      47.0000000   30.70588  34.7%  17.1    0s

Cutting planes:
  Gomory: 1
  Zero half: 3
  Mod-K: 1

Explored 2483 nodes (40783 simplex iterations) in 1.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%