Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:09 2013

Optimize a model with 520 rows, 4460 columns and 9500 nonzeros
Presolve removed 40 rows and 40 columns
Presolve time: 0.03s
Presolved: 480 rows, 4420 columns, 9360 nonzeros
Variable types: 4240 continuous, 180 integer (180 binary)

Root relaxation: objective 4.642213e+04, 563 iterations, 0.02 seconds

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

     0     0 46422.1265    0    3          - 46422.1265     -      -    0s
     0     0 46445.5045    0    2          - 46445.5045     -      -    0s
     0     0 46446.0049    0    3          - 46446.0049     -      -    0s
     0     0 46448.3762    0    2          - 46448.3762     -      -    0s
     0     0 46448.5919    0    3          - 46448.5919     -      -    0s
     0     0 46449.4454    0    2          - 46449.4454     -      -    0s
     0     0 46449.4454    0    2          - 46449.4454     -      -    0s
H    0     0                    47019.374336 46449.4454  1.21%     -    0s
     0     2 46454.9554    0    2 47019.3743 46454.9554  1.20%     -    0s
*   13    10               7    46994.463488 46551.1368  0.94%  33.4    0s
*   17     8               8    46989.286113 46551.1368  0.93%  30.8    0s
*   27    10               7    46799.107742 46569.2940  0.49%  29.5    0s
H   30     5                    46797.700049 46569.2940  0.49%  26.7    0s
*   55     8               6    46756.955185 46602.6456  0.33%  26.9    0s
*   67     1               6    46742.720716 46740.4887  0.00%  25.5    0s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 68 nodes (2360 simplex iterations) in 0.37 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.674272071620e+04, best bound 4.674048874140e+04, gap 0.0048%