Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:12:30 2013

Optimize a model with 561 rows, 26061 columns and 52071 nonzeros
Presolve time: 0.04s
Presolved: 561 rows, 26061 columns, 52071 nonzeros
Variable types: 26010 continuous, 51 integer (51 binary)

Root relaxation: objective 5.144143e+04, 949 iterations, 0.02 seconds

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

     0     0 51441.4334    0    8          - 51441.4334     -      -    0s
H    0     0                    54386.000000 51441.4334  5.41%     -    0s
H    0     0                    52567.000000 51441.4334  2.14%     -    0s
     0     0 51597.8593    0    6 52567.0000 51597.8593  1.84%     -    0s
     0     0 51628.1392    0    6 52567.0000 51628.1392  1.79%     -    0s
     0     0 51635.1840    0    6 52567.0000 51635.1840  1.77%     -    0s
     0     0 51635.1840    0    6 52567.0000 51635.1840  1.77%     -    0s
     0     0 51635.2955    0    7 52567.0000 51635.2955  1.77%     -    0s
     0     0 51635.2955    0    7 52567.0000 51635.2955  1.77%     -    0s
H    0     0                    51807.000000 51635.2955  0.33%     -    0s
     0     2 51648.3426    0    7 51807.0000 51648.3426  0.31%     -    0s

Cutting planes:
  Implied bound: 96
  Flow cover: 9

Explored 22 nodes (1775 simplex iterations) in 0.73 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.180700000000e+04, best bound 5.180700000000e+04, gap 0.0%