Gurobi 5.6.3 (linux64) logging started Wed Oct  8 06:15:21 2014

Optimize a model with 57841 rows, 57840 columns and 173040 nonzeros
Presolve time: 1.58s
Presolved: 57841 rows, 57840 columns, 173040 nonzeros
Variable types: 0 continuous, 57840 integer (57840 binary)
Found heuristic solution: objective 23.0713016

Root relaxation: objective 1.555212e+01, 3052 iterations, 0.51 seconds

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

*    0     0               0      15.5521248   15.55212  0.00%     -    2s

Explored 0 nodes (3052 simplex iterations) in 2.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.555212484805e+01, best bound 1.555212484805e+01, gap 0.0%