Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:29 2013

Optimize a model with 495 rows, 20295 columns and 40545 nonzeros
Presolve time: 0.03s
Presolved: 495 rows, 20295 columns, 40545 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 5.213798e+04, 981 iterations, 0.02 seconds

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

     0     0 52137.9786    0    8          - 52137.9786     -      -    0s
H    0     0                    53847.000000 52137.9786  3.17%     -    0s
     0     0 52550.4213    0    4 53847.0000 52550.4213  2.41%     -    0s
     0     0 52587.3009    0    5 53847.0000 52587.3009  2.34%     -    0s
H    0     0                    53406.000000 52587.3009  1.53%     -    0s
     0     0 52603.4498    0    6 53406.0000 52603.4498  1.50%     -    0s
     0     0 52611.5049    0    5 53406.0000 52611.5049  1.49%     -    0s
     0     0 52616.4229    0    6 53406.0000 52616.4229  1.48%     -    0s
     0     0 52618.9670    0    6 53406.0000 52618.9670  1.47%     -    0s
     0     0 52619.0445    0    7 53406.0000 52619.0445  1.47%     -    0s
     0     0 52619.2024    0    5 53406.0000 52619.2024  1.47%     -    0s
     0     2 52622.9416    0    5 53406.0000 52622.9416  1.47%     -    0s
H    2     2                    53296.923827 52662.1053  1.19%  33.0    0s
H    3     3                    52784.000000 52662.8547  0.23%  31.7    0s
*    8     4               7    52714.000000 52690.9377  0.04%  36.6    0s

Cutting planes:
  Implied bound: 86
  Flow cover: 3

Explored 11 nodes (1589 simplex iterations) in 0.57 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.271400000000e+04, best bound 5.271238088901e+04, gap 0.0031%