Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:00:15 2013

Optimize a model with 18102 rows, 17682 columns and 70602 nonzeros
Presolve removed 1312 rows and 0 columns
Presolve time: 0.10s
Presolved: 16790 rows, 17682 columns, 67978 nonzeros
Variable types: 17640 continuous, 42 integer (42 binary)

Root relaxation: objective 5.126910e+04, 3265 iterations, 0.29 seconds

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

     0     0 51269.0965    0    4          - 51269.0965     -      -    0s
H    0     0                    51600.000000 51269.0965  0.64%     -    0s
H    0     0                    51465.000000 51269.0965  0.38%     -    0s
     0     0 51274.0941    0    6 51465.0000 51274.0941  0.37%     -    0s
     0     0 51274.0941    0    6 51465.0000 51274.0941  0.37%     -    0s
     0     0 51308.2523    0    4 51465.0000 51308.2523  0.30%     -    0s
     0     0 51343.6451    0    3 51465.0000 51343.6451  0.24%     -    1s
     0     0 51343.6451    0    3 51465.0000 51343.6451  0.24%     -    1s
     0     0 51346.0197    0    4 51465.0000 51346.0197  0.23%     -    1s
     0     0 51365.7826    0    2 51465.0000 51365.7826  0.19%     -    1s
     0     2 51365.9090    0    2 51465.0000 51365.9090  0.19%     -    1s
*    6     2               4    51415.000000 51395.8324  0.04%  38.7    1s

Cutting planes:
  Gomory: 3
  Flow cover: 3

Explored 9 nodes (5137 simplex iterations) in 1.81 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.141500000000e+04, best bound 5.141500000000e+04, gap 0.0%