Gurobi 5.0.1 (linux64) logging started Wed Apr 24 13:55:55 2013

Optimize a model with 2860 rows, 676260 columns and 1352260 nonzeros
Presolve time: 2.88s
Presolved: 2860 rows, 676260 columns, 1352260 nonzeros
Variable types: 676000 continuous, 260 integer (260 binary)

Root relaxation: objective 4.758443e+05, 18161 iterations, 3.92 seconds

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

     0     0 475844.329    0    3          - 475844.329     -      -    7s
H    0     0                    487652.00000 475844.329  2.42%     -    8s
H    0     0                    480779.00000 475844.329  1.03%     -   10s
     0     0 476034.392    0    3 480779.000 476034.392  0.99%     -   11s
     0     0 476034.392    0    3 480779.000 476034.392  0.99%     -   16s
     0     0 476034.392    0    3 480779.000 476034.392  0.99%     -   18s
     0     0 476044.432    0    3 480779.000 476044.432  0.98%     -   18s
     0     0 476056.006    0    2 480779.000 476056.006  0.98%     -   19s
     0     0 476056.305    0    2 480779.000 476056.305  0.98%     -   20s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   20s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   21s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   22s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   22s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   23s
     0     0 476056.786    0    1 480779.000 476056.786  0.98%     -   24s
     0     2 476058.473    0    1 480779.000 476058.473  0.98%     -   26s
H    4     4                    480433.00000 476164.652  0.89%   132   29s
     6     8 476232.075    5    2 480433.000 476232.075  0.87%   153   30s
H    9     9                    478425.00000 476232.075  0.46%   114   31s
H   14    10                    477697.00000 476232.075  0.31%  97.5   32s
H   19    13                    477498.00000 476232.075  0.27%  89.9   34s
H   20    13                    477408.00000 476232.075  0.25%  85.6   34s
*   21    14              19    477307.00000 476232.075  0.23%  82.1   34s
    23    12 476273.656    2    3 477307.000 476273.656  0.22%  97.0   35s
*   31    14               9    476908.00000 476335.093  0.12%   108   38s
    36    14     cutoff    7      476908.000 476415.857  0.10%   117   40s
*   50    12              15    476869.00000 476456.081  0.09%   141   43s
    52    12 476611.417    2    3 476869.000 476466.806  0.08%   156   45s
    64     5 476865.269    6    3 476869.000 476778.968  0.02%   176   50s

Cutting planes:
  Implied bound: 177
  Flow cover: 4

Explored 68 nodes (42099 simplex iterations) in 51.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.768690000000e+05, best bound 4.768296935484e+05, gap 0.0082%