Gurobi 5.0.1 (linux64) logging started Wed Apr 24 00:51:49 2013

Optimize a model with 4220 rows, 4020 columns and 16020 nonzeros
Presolve removed 180 rows and 0 columns
Presolve time: 0.02s
Presolved: 4040 rows, 4020 columns, 15660 nonzeros
Variable types: 4000 continuous, 20 integer (20 binary)

Root relaxation: objective 2.168448e+04, 583 iterations, 0.02 seconds

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

     0     0 21684.4839    0    1          - 21684.4839     -      -    0s
H    0     0                    21692.000000 21684.4839  0.03%     -    0s
     0     0 21685.2000    0    1 21692.0000 21685.2000  0.03%     -    0s

Explored 0 nodes (589 simplex iterations) in 0.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.169200000000e+04, best bound 2.169200000000e+04, gap 0.0%