Gurobi 5.6.3 (linux64) logging started Wed Oct  8 06:43:16 2014

Optimize a model with 59781 rows, 59780 columns and 178852 nonzeros
Presolve time: 1.54s
Presolved: 59781 rows, 59780 columns, 178852 nonzeros
Variable types: 0 continuous, 59780 integer (59780 binary)
Found heuristic solution: objective 25.2065440

Root relaxation: objective 1.601163e+01, 3396 iterations, 0.73 seconds

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

     0     0   16.01163    0  273   25.20654   16.01163  36.5%     -    2s
H    0     0                      16.0158862   16.01163  0.03%     -    2s
     0     0     cutoff    0        16.01589   16.01589  0.00%     -    2s

Cutting planes:
  Gomory: 1
  Zero half: 11

Explored 0 nodes (3398 simplex iterations) in 2.96 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.601588624046e+01, best bound 1.601588624046e+01, gap 0.0%