Optimize a model with 280 rows, 39060 columns and 78120 nonzeros
Presolve time: 0.19s
Presolved: 280 rows, 39060 columns, 78120 nonzeros
Variable types: 0 continuous, 39060 integer (39060 binary)

Root relaxation: objective 2.534000e+03, 409 iterations, 0.01 seconds

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

     0     0 2534.00000    0   32          - 2534.00000     -      -    0s
     0     0 2536.50000    0   20          - 2536.50000     -      -    0s
     0     0 2539.16667    0   40          - 2539.16667     -      -    0s
     0     0 2539.66667    0   46          - 2539.66667     -      -    0s
     0     0 2541.00000    0   31          - 2541.00000     -      -    1s
     0     0 2541.66667    0   32          - 2541.66667     -      -    1s
     0     0 2542.00000    0   30          - 2542.00000     -      -    1s
     0     0 2542.16667    0   42          - 2542.16667     -      -    1s
     0     0 2542.50000    0   40          - 2542.50000     -      -    1s
     0     0 2543.00000    0   45          - 2543.00000     -      -    1s
     0     0 2543.00000    0   48          - 2543.00000     -      -    1s
     0     0 2543.00000    0   31          - 2543.00000     -      -    1s
     0     2 2543.02941    0   31          - 2543.02941     -      -    2s
    30    32 2578.50000   23   52          - 2568.80000     -   10.5    5s
   113   115 2597.00000   98   42          - 2568.80000     -    4.3   10s
   187   189 2628.00000  166   20          - 2568.80000     -    4.3   15s
   257   259 2663.50000  222   35          - 2568.80000     -    4.4   20s
   323   325 2697.00000  275   12          - 2568.80000     -    4.2   25s
   387   389 2722.00000  329   20          - 2568.80000     -    4.1   30s
   453   455 2765.66667  380   25          - 2568.80000     -    4.0   35s
   517   519 2793.50000  436    6          - 2568.80000     -    3.8   40s
*  546   525             464    2801.0000000 2568.80000  8.29%   3.7   43s
   564   535 2581.00000   14   42 2801.00000 2568.80000  8.29%   3.8   45s
*  579    64              25    2584.0000000 2568.80000  0.59%   3.8   46s
   619    83 2582.00000    5   43 2584.00000 2571.30000  0.49%   4.0   50s
*  649    57              13    2581.0000000 2571.80000  0.36%   4.1   52s
*  676    36               9    2579.0000000 2572.25000  0.26%   4.2   54s
   686    32 2578.00000    6   57 2579.00000 2572.30000  0.26%   4.3   55s
   751    19     cutoff    9      2579.00000 2574.80000  0.16%   4.6   60s

Cutting planes:
  User: 169
  Zero half: 35

Explored 800 nodes (4311 simplex iterations) in 63.59 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.579000000000e+03, best bound 2.579000000000e+03, gap 0.0%

Gurobi 5.0.1 (linux64) logging started Sun Nov 25 06:12:46 2012