Gurobi 5.0.1 (linux64) logging started Wed Apr 24 00:51:53 2013

Optimize a model with 4240 rows, 4040 columns and 16040 nonzeros
Presolve removed 20 rows and 0 columns
Presolve time: 0.02s
Presolved: 4220 rows, 4040 columns, 16020 nonzeros
Variable types: 4020 continuous, 20 integer (20 binary)

Root relaxation: objective 2.057244e+04, 539 iterations, 0.02 seconds

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

     0     0 20572.4351    0   13          - 20572.4351     -      -    0s
H    0     0                    21796.000000 20572.4351  5.61%     -    0s
     0     0 21234.7128    0    2 21796.0000 21234.7128  2.58%     -    0s
H    0     0                    21362.856410 21234.7128  0.60%     -    0s
     0     0 21234.8154    0    1 21362.8564 21234.8154  0.60%     -    0s
H    0     0                    21351.984615 21234.8154  0.55%     -    0s
H    0     0                    21281.000000 21234.8154  0.22%     -    0s
     0     0     cutoff    0      21281.0000 21281.0000   0.0%     -    0s

Cutting planes:
  Implied bound: 12

Explored 1 nodes (693 simplex iterations) in 0.16 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.128100000000e+04, best bound 2.128100000000e+04, gap 0.0%