Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:25:20 2012

Optimize a model with 10903 rows, 3422 columns and 35842 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.27s
Presolved: 10901 rows, 3420 columns, 35466 nonzeros
Variable types: 0 continuous, 3420 integer (3420 binary)
Found heuristic solution: objective 58.0000000

Root relaxation: objective 2.000000e+00, 2400 iterations, 0.08 seconds

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

     0     0    2.00000    0  116   58.00000    2.00000  96.6%     -    0s
H    0     0                      51.0000000    2.00000  96.1%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    2.66667    0  278    5.00000    2.66667  46.7%     -    1s
     0     0    2.67879    0 3094    5.00000    2.67879  46.4%     -    2s
     0     0    2.67879    0 3103    5.00000    2.67879  46.4%     -    3s
     0     0    2.67879    0 2757    5.00000    2.67879  46.4%     -    5s
     0     0    2.67879    0 2827    5.00000    2.67879  46.4%     -    6s
     0     0    2.67879    0 2831    5.00000    2.67879  46.4%     -    7s
     0     0    2.67879    0 2831    5.00000    2.67879  46.4%     -    8s
     0     0    2.67879    0 2831    5.00000    2.67879  46.4%     -    9s
     0     2    3.00000    0 2831    5.00000    3.00000  40.0%     -   14s
     3     5    4.00000    3  133    5.00000    3.00000  40.0%  3007   15s
*   13     4              12       4.0000000    3.00000  25.0%   757   15s

Cutting planes:
  Clique: 173
  Zero half: 24

Explored 22 nodes (40320 simplex iterations) in 16.15 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%