Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:36 2012

Optimize a model with 555 rows, 540 columns and 1783 nonzeros
Presolve removed 40 rows and 25 columns
Presolve time: 0.01s
Presolved: 515 rows, 515 columns, 1698 nonzeros
Variable types: 345 continuous, 170 integer (170 binary)

Root relaxation: objective 5.404932e+04, 266 iterations, 0.00 seconds

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

     0     0 54049.3180    0   81          - 54049.3180     -      -    0s
H    0     0                    79447.000000 54049.3180  32.0%     -    0s
     0     0 61640.8919    0   21 79447.0000 61640.8919  22.4%     -    0s
     0     0 61761.8466    0   16 79447.0000 61761.8466  22.3%     -    0s
     0     0 61840.4807    0   20 79447.0000 61840.4807  22.2%     -    0s
     0     0 61846.0960    0   18 79447.0000 61846.0960  22.2%     -    0s
     0     0 61864.8091    0   13 79447.0000 61864.8091  22.1%     -    0s
     0     0 61878.9998    0   16 79447.0000 61878.9998  22.1%     -    0s
     0     0 61882.3407    0   13 79447.0000 61882.3407  22.1%     -    0s
     0     0 61882.7531    0   15 79447.0000 61882.7531  22.1%     -    0s
     0     2 61907.1393    0   15 79447.0000 61907.1393  22.1%     -    0s
H   27    20                    62616.000000 61926.7051  1.10%   2.9    0s
*  176    21              37    62608.000000 62533.5592  0.12%   3.9    0s

Cutting planes:
  Gomory: 14
  Cover: 12
  Implied bound: 3
  Flow cover: 64
  Flow path: 42

Explored 213 nodes (1201 simplex iterations) in 0.13 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.260800000000e+04, best bound 6.260517110974e+04, gap 0.0045%