Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:18:59 2013

Optimize a model with 810 rows, 13635 columns and 504737 nonzeros
Presolve removed 27 rows and 107 columns
Presolve time: 3.96s
Presolved: 783 rows, 13528 columns, 501074 nonzeros
Variable types: 0 continuous, 13528 integer (13528 binary)
Found heuristic solution: objective 6798.0000000

Root relaxation: objective 4.530000e+03, 2567 iterations, 0.60 seconds

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

     0     0 4530.00000    0   31 6798.00000 4530.00000  33.4%     -    4s
H    0     0                    4666.0000000 4530.00000  2.91%     -    4s
H    0     0                    4663.0000000 4530.00000  2.85%     -    4s
     0     0 4533.94444    0   75 4663.00000 4533.94444  2.77%     -    5s
H    0     0                    4662.0000000 4533.94444  2.75%     -    6s
     0     0 4533.94444    0   31 4662.00000 4533.94444  2.75%     -    7s
     0     0 4533.97059    0   89 4662.00000 4533.97059  2.75%     -    7s
H    0     0                    4636.0000000 4533.97059  2.20%     -    8s
H    0     0                    4563.0000000 4533.97059  0.64%     -    8s
H    0     0                    4557.0000000 4533.97059  0.51%     -    8s
*    0     0               0    4536.0000000 4536.00000   0.0%     -    8s

Cutting planes:
  Gomory: 1
  Clique: 12
  Zero half: 12

Explored 0 nodes (6486 simplex iterations) in 8.54 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.536000000000e+03, best bound 4.536000000000e+03, gap 0.0%