Gurobi 5.6.3 (linux64) logging started Wed Oct  8 05:54:50 2014

Optimize a model with 56407 rows, 56406 columns and 168744 nonzeros
Presolve time: 1.57s
Presolved: 56407 rows, 56406 columns, 168744 nonzeros
Variable types: 0 continuous, 56406 integer (56406 binary)
Found heuristic solution: objective 20.5385523

Root relaxation: objective 1.545882e+01, 2864 iterations, 0.44 seconds

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

*    0     0               0      15.4588219   15.45882  0.00%     -    2s

Explored 0 nodes (2864 simplex iterations) in 2.17 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.545882191981e+01, best bound 1.545882191981e+01, gap 0.0%