Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:15:36 2012

Optimize a model with 3480 rows, 1640 columns and 11920 nonzeros
Presolve removed 1001 rows and 40 columns
Presolve time: 0.06s
Presolved: 2479 rows, 1600 columns, 9480 nonzeros
Variable types: 0 continuous, 1600 integer (1600 binary)
Found heuristic solution: objective 25.0000000

Root relaxation: objective 4.000000e+00, 2679 iterations, 0.14 seconds

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

*    0     0               0       4.0000000    4.00000   0.0%     -    0s

Explored 0 nodes (3073 simplex iterations) in 0.23 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%