Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:51 2012

Optimize a model with 537 rows, 147 columns and 1074 nonzeros
Presolve removed 96 rows and 0 columns
Presolve time: 0.00s
Presolved: 441 rows, 147 columns, 940 nonzeros
Variable types: 0 continuous, 147 integer (147 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 6.076562e+01, 252 iterations, 0.00 seconds

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

     0     0   60.76562    0  140   46.00000   60.76562  32.1%     -    0s
     0     0   59.28000    0  142   46.00000   59.28000  28.9%     -    0s
     0     0   58.72347    0  146   46.00000   58.72347  27.7%     -    0s
H    0     0                      47.0000000   58.72347  24.9%     -    0s
H    0     0                      48.0000000   58.72347  22.3%     -    0s
     0     0   58.45092    0  145   48.00000   58.45092  21.8%     -    0s
     0     0   58.09250    0  143   48.00000   58.09250  21.0%     -    0s
     0     0   57.96282    0  139   48.00000   57.96282  20.8%     -    0s
     0     0   57.83995    0  142   48.00000   57.83995  20.5%     -    0s
H    0     0                      49.0000000   57.83995  18.0%     -    0s
     0     0   57.81621    0  146   49.00000   57.81621  18.0%     -    0s
     0     0   57.81621    0  146   49.00000   57.81621  18.0%     -    0s
     0     2   57.81174    0  146   49.00000   57.81174  18.0%     -    0s
*    9     9               8      50.0000000   57.80607  15.6%  47.3    0s
H   65    23                      52.0000000   57.18377  10.0%  32.7    0s

Cutting planes:
  Gomory: 1
  Zero half: 105

Explored 773 nodes (22802 simplex iterations) in 0.83 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%