Gurobi 5.6.3 (linux64) logging started Tue Oct  7 20:36:53 2014

Optimize a model with 3969 rows, 3907 columns and 15438 nonzeros
Presolve time: 0.11s
Presolved: 3969 rows, 3907 columns, 15438 nonzeros
Variable types: 1 continuous, 3906 integer (3906 binary)
Found heuristic solution: objective 0.8304686
Found heuristic solution: objective 0.8197806
Found heuristic solution: objective 0.7616841

Root relaxation: objective 1.535800e-01, 2022 iterations, 0.10 seconds

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

     0     0    0.15358    0  543    0.76168    0.15358  79.8%     -    0s
H    0     0                       0.5457011    0.15358  71.9%     -    0s
     0     0    0.15783    0  439    0.54570    0.15783  71.1%     -    0s
     0     0    0.15783    0  522    0.54570    0.15783  71.1%     -    0s
H    0     0                       0.5307709    0.15783  70.3%     -    0s
H    0     0                       0.3698364    0.15783  57.3%     -    0s
     0     0    0.15783    0  448    0.36984    0.15783  57.3%     -    1s
H    0     0                       0.3597661    0.15783  56.1%     -    1s
     0     2    0.16078    0  448    0.35977    0.16078  55.3%     -    3s
H    1     2                       0.2662983    0.16078  39.6%   610    3s
*   44    18              26       0.2654201    0.18064  31.9%   195    4s
*   46    16              25       0.2614037    0.18064  30.9%   186    4s
*   50    18              13       0.2596758    0.18067  30.4%   181    4s
*   57    15              15       0.2585252    0.18067  30.1%   163    4s
*   59    13              16       0.2563980    0.18067  29.5%   158    4s

Cutting planes:
  Gomory: 5
  MIR: 11
  Mod-K: 1

Explored 76 nodes (19816 simplex iterations) in 4.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.563980220575e-01, best bound 2.563980220575e-01, gap 0.0%