Gurobi 5.6.3 (linux64) logging started Wed Oct  8 06:57:22 2014

Optimize a model with 60763 rows, 60762 columns and 181794 nonzeros
Presolve time: 1.61s
Presolved: 60763 rows, 60762 columns, 181794 nonzeros
Variable types: 0 continuous, 60762 integer (60762 binary)
Found heuristic solution: objective 24.0990152

Root relaxation: objective 1.589684e+01, 3197 iterations, 0.58 seconds

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

     0     0   15.89684    0   82   24.09902   15.89684  34.0%     -    2s
H    0     0                      15.9009803   15.89684  0.03%     -    2s
     0     0     cutoff    0        15.90098   15.90098  0.00%     -    2s

Cutting planes:
  Gomory: 1
  Zero half: 1

Explored 0 nodes (3199 simplex iterations) in 2.72 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.590098030197e+01, best bound 1.590098030197e+01, gap 0.0%