Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:12:11 2013

Optimize a model with 26571 rows, 26061 columns and 104091 nonzeros
Presolve removed 1575 rows and 0 columns
Presolve time: 0.15s
Presolved: 24996 rows, 26061 columns, 100941 nonzeros
Variable types: 26010 continuous, 51 integer (51 binary)

Root relaxation: objective 5.164335e+04, 4222 iterations, 0.50 seconds

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

     0     0 51643.3509    0    6          - 51643.3509     -      -    0s
H    0     0                    53868.000000 51643.3509  4.13%     -    0s
H    0     0                    51807.000000 51643.3509  0.32%     -    0s
     0     0 51645.5882    0    8 51807.0000 51645.5882  0.31%     -    0s
     0     0 51645.5882    0    8 51807.0000 51645.5882  0.31%     -    1s
     0     0 51653.6007    0    6 51807.0000 51653.6007  0.30%     -    1s
     0     0 51653.6007    0    5 51807.0000 51653.6007  0.30%     -    2s
     0     0 51653.7028    0    6 51807.0000 51653.7028  0.30%     -    2s
     0     0 51653.7028    0    6 51807.0000 51653.7028  0.30%     -    2s
     0     2 51661.5706    0    6 51807.0000 51661.5706  0.28%     -    2s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 13 nodes (6269 simplex iterations) in 2.83 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.180700000000e+04, best bound 5.180657675753e+04, gap 0.0008%