Gurobi 5.6.3 (linux64) logging started Wed Oct  8 05:05:41 2014

Optimize a model with 53131 rows, 53130 columns and 158930 nonzeros
Presolve time: 1.47s
Presolved: 53131 rows, 53130 columns, 158930 nonzeros
Variable types: 0 continuous, 53130 integer (53130 binary)
Found heuristic solution: objective 22.6131805

Root relaxation: objective 1.507812e+01, 2844 iterations, 0.44 seconds

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

*    0     0               0      15.0781198   15.07812  0.00%     -    2s

Explored 0 nodes (2844 simplex iterations) in 2.05 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.507811975377e+01, best bound 1.507811975377e+01, gap 0.0%