Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:11:38 2012

Optimize a model with 5585 rows, 2450 columns and 18961 nonzeros
Presolve removed 1227 rows and 2 columns
Presolve time: 0.12s
Presolved: 4407 rows, 2448 columns, 18293 nonzeros
Variable types: 0 continuous, 2448 integer (2448 binary)
Found heuristic solution: objective 49.0000000

Root relaxation: objective 3.000000e+00, 4200 iterations, 0.48 seconds

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

     0     0    3.00000    0  104   49.00000    3.00000  93.9%     -    2s
H    0     0                       4.0000000    3.00000  25.0%     -    2s
     0     0    3.00000    0  212    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   79    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   91    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   99    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   97    4.00000    3.00000  25.0%     -    8s
     0     0    3.00000    0   99    4.00000    3.00000  25.0%     -    9s
     0     0    3.00000    0   77    4.00000    3.00000  25.0%     -   10s
     0     2    3.00000    0   77    4.00000    3.00000  25.0%     -   11s
     4     4    3.00000    1  669    4.00000    3.00000  25.0%   468   16s
     7     6    3.00000    1  103    4.00000    3.00000  25.0%   267   21s

Cutting planes:
  Gomory: 15
  Zero half: 52

Explored 9 nodes (122805 simplex iterations) in 24.37 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%