Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:06:12 2013

Optimize a model with 517 rows, 22137 columns and 44227 nonzeros
Presolve time: 0.03s
Presolved: 517 rows, 22137 columns, 44227 nonzeros
Variable types: 22090 continuous, 47 integer (47 binary)

Root relaxation: objective 5.170564e+04, 821 iterations, 0.02 seconds

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

     0     0 51705.6357    0   11          - 51705.6357     -      -    0s
H    0     0                    53424.000000 51705.6357  3.22%     -    0s
H    0     0                    52018.000000 51705.6357  0.60%     -    0s
     0     0 51868.5890    0    6 52018.0000 51868.5890  0.29%     -    0s
     0     0 51877.1361    0    7 52018.0000 51877.1361  0.27%     -    0s
     0     0 51877.1361    0   11 52018.0000 51877.1361  0.27%     -    0s
     0     0 51877.1361    0    7 52018.0000 51877.1361  0.27%     -    0s
     0     0 51877.9822    0    6 52018.0000 51877.9822  0.27%     -    0s
     0     0 51878.4713    0    4 52018.0000 51878.4713  0.27%     -    0s
     0     0 51879.2227    0    5 52018.0000 51879.2227  0.27%     -    0s
     0     0 51879.3750    0    4 52018.0000 51879.3750  0.27%     -    0s
     0     2 51879.5992    0    4 52018.0000 51879.5992  0.27%     -    0s
H    7     2                    51933.432432 51897.7257  0.07%  17.0    0s
H    8     3                    51926.083333 51897.7257  0.05%  16.1    0s
*    8     3               6    51918.000000 51897.7257  0.04%  16.2    0s

Cutting planes:
  Implied bound: 75
  Flow cover: 10

Explored 16 nodes (2149 simplex iterations) in 0.57 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.191800000000e+04, best bound 5.191800000000e+04, gap 0.0%