Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:48 2013

Optimize a model with 60 rows, 462 columns and 4136 nonzeros
Presolve removed 22 rows and 23 columns
Presolve time: 0.01s
Presolved: 38 rows, 439 columns, 3692 nonzeros
Variable types: 423 continuous, 16 integer (16 binary)

Root relaxation: objective 7.444602e+03, 12 iterations, 0.00 seconds

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

     0     0 7444.60178    0    3          - 7444.60178     -      -    0s
     0     0 7446.54589    0    3          - 7446.54589     -      -    0s
     0     0 7458.44329    0    3          - 7458.44329     -      -    0s
     0     0 7459.10717    0    1          - 7459.10717     -      -    0s
H    0     0                    7538.0054751 7459.10717  1.05%     -    0s
H    0     0                    7521.1207471 7459.10717  0.82%     -    0s
     0     0 7459.10717    0    1 7521.12075 7459.10717  0.82%     -    0s
     0     0 7459.12126    0    3 7521.12075 7459.12126  0.82%     -    0s
     0     0 7459.12346    0    3 7521.12075 7459.12346  0.82%     -    0s
H    0     0                    7459.1534069 7459.12346  0.00%     -    0s

Cutting planes:
  Cover: 1
  Implied bound: 2
  Flow cover: 2

Explored 0 nodes (52 simplex iterations) in 0.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.459153406943e+03, best bound 7.459123455328e+03, gap 0.0004%