Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:26:00 2012

Optimize a model with 19271 rows, 5402 columns and 62851 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.67s
Presolved: 19342 rows, 5400 columns, 67652 nonzeros
Variable types: 0 continuous, 5400 integer (5400 binary)
Found heuristic solution: objective 73.0000000

Root relaxation: objective 2.000000e+00, 3731 iterations, 0.15 seconds

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

     0     0    2.00000    0  146   73.00000    2.00000  97.3%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    2.66667    0  392    5.00000    2.66667  46.7%     -    6s
     0     0    2.67943    0 4751    5.00000    2.67943  46.4%     -    8s
     0     0    2.67943    0 4761    5.00000    2.67943  46.4%     -   11s
     0     0    2.67943    0 4214    5.00000    2.67943  46.4%     -   24s
     0     0    2.67943    0 4063    5.00000    2.67943  46.4%     -   34s
     0     0    2.67943    0 3992    5.00000    2.67943  46.4%     -   43s
     0     0    2.67943    0 4012    5.00000    2.67943  46.4%     -   53s
     0     0    2.67943    0 4057    5.00000    2.67943  46.4%     -   62s
     0     0    2.67943    0 4139    5.00000    2.67943  46.4%     -   72s
     0     0    2.67943    0 4255    5.00000    2.67943  46.4%     -   84s
     0     0    2.67943    0 4255    5.00000    2.67943  46.4%     -   90s
     0     2    3.00000    0 4254    5.00000    3.00000  40.0%     -  120s
*   28     3              20       4.0000000    4.00000   0.0%   888  124s

Cutting planes:
  Clique: 157
  Zero half: 10

Explored 29 nodes (256145 simplex iterations) in 124.41 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%