Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:16:41 2012

Optimize a model with 3559 rows, 1640 columns and 12118 nonzeros
Presolve removed 642 rows and 2 columns
Presolve time: 0.11s
Presolved: 2957 rows, 1638 columns, 12052 nonzeros
Variable types: 0 continuous, 1638 integer (1638 binary)
Found heuristic solution: objective 40.0000000

Root relaxation: objective 3.000000e+00, 2469 iterations, 0.18 seconds

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

     0     0    3.00000    0   49   40.00000    3.00000  92.5%     -    0s
H    0     0                      34.0000000    3.00000  91.2%     -    0s
H    0     0                       4.0000000    3.00000  25.0%     -    0s
     0     0    3.00000    0   69    4.00000    3.00000  25.0%     -    0s
     0     0    3.00000    0   70    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   71    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0   59    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   61    4.00000    3.00000  25.0%     -    2s
     0     0    3.00000    0   61    4.00000    3.00000  25.0%     -    2s
     0     2    3.00000    0   61    4.00000    3.00000  25.0%     -    3s
     4     4    3.00000    1  399    4.00000    3.00000  25.0%   610    5s
     9     8    3.00000    1  119    4.00000    3.00000  25.0%   271   10s
    14    13    3.00000   11   64    4.00000    3.00000  25.0%  4484   15s
    25     7    3.00000   12  537    4.00000    3.00000  25.0%  2657   20s

Cutting planes:
  Gomory: 12
  Zero half: 18

Explored 31 nodes (95742 simplex iterations) in 23.08 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%