Gurobi 5.0.1 (linux64) logging started Fri Nov 16 16:00:28 2012

Optimize a model with 12357 rows, 5550 columns and 42252 nonzeros
Presolve removed 1410 rows and 150 columns
Presolve time: 0.55s
Presolved: 10947 rows, 5400 columns, 38404 nonzeros
Variable types: 0 continuous, 5400 integer (5400 binary)
Found heuristic solution: objective 74.0000000

Root relaxation: objective 3.000000e+00, 7068 iterations, 1.12 seconds
Total elapsed time = 6.48s
Total elapsed time = 11.48s

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

     0     0    3.00000    0  797   74.00000    3.00000  95.9%     -   12s
H    0     0                      50.0000000    3.00000  94.0%     -   12s
H    0     0                      23.0000000    3.00000  87.0%     -   12s
     0     0    3.00000    0 1225   23.00000    3.00000  87.0%     -   13s
H    0     0                      11.0000000    3.00000  72.7%     -   13s
H    0     0                       7.0000000    3.00000  57.1%     -   13s
     0     0    3.00000    0  106    7.00000    3.00000  57.1%     -   22s
H    0     0                       4.0000000    3.00000  25.0%     -   22s
     0     0    3.00000    0  118    4.00000    3.00000  25.0%     -   31s
     0     0    3.00000    0  132    4.00000    3.00000  25.0%     -   36s
     0     0    3.00000    0  122    4.00000    3.00000  25.0%     -   44s
     0     0    3.00000    0  126    4.00000    3.00000  25.0%     -   52s
     0     0    3.00000    0  126    4.00000    3.00000  25.0%     -   56s
     0     2    3.00000    0  111    4.00000    3.00000  25.0%     -   68s
     2     3    3.00000    1  126    4.00000    3.00000  25.0%  8031   73s
     4     4    3.00000    1 1359    4.00000    3.00000  25.0%  4016   84s
     5     5    3.00000    1  132    4.00000    3.00000  25.0%  3212   92s
     6     6    3.00000    1  104    4.00000    3.00000  25.0%  2677   95s
     9     8    3.00000    1  110    4.00000    3.00000  25.0%  1785  101s
    12    10    3.00000    1   91    4.00000    3.00000  25.0%  1338  107s
    13    10    3.00000    1  127    4.00000    3.00000  25.0%  1236  110s
    16    12    3.00000    1  107    4.00000    3.00000  25.0%  1004  118s
    17    13    3.00000    1  105    4.00000    3.00000  25.0%   945  120s
    23    17    3.00000   12  139    4.00000    3.00000  25.0% 10048  125s
    31    16    3.00000   14 1119    4.00000    3.00000  25.0%  7664  170s
    38    12    3.00000   15 1573    4.00000    3.00000  25.0%  6395  208s
    39    13    3.00000   15  351    4.00000    3.00000  25.0%  6355  215s

Cutting planes:
  Gomory: 2
  Zero half: 12

Explored 56 nodes (430969 simplex iterations) in 215.48 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%