Gurobi 5.6.3 (linux64) logging started Wed Oct  8 06:50:56 2014

Optimize a model with 60271 rows, 60270 columns and 180320 nonzeros
Presolve time: 1.65s
Presolved: 60271 rows, 60270 columns, 180320 nonzeros
Variable types: 0 continuous, 60270 integer (60270 binary)
Found heuristic solution: objective 31.7043432

Root relaxation: objective 1.554146e+01, 3208 iterations, 0.56 seconds

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

*    0     0               0      15.5414571   15.54146  0.00%     -    2s

Explored 0 nodes (3208 simplex iterations) in 2.38 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.554145705444e+01, best bound 1.554145705444e+01, gap 0.0%