Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:46:23 2012

Optimize a model with 9380 rows, 3540 columns and 31386 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.22s
Presolved: 9437 rows, 3538 columns, 34549 nonzeros
Variable types: 0 continuous, 3538 integer (3538 binary)
Found heuristic solution: objective 59.0000000

Root relaxation: objective 2.000000e+00, 2555 iterations, 0.07 seconds

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

     0     0    2.00000    0  118   59.00000    2.00000  96.6%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
H    0     0                       4.0000000    2.00000  50.0%     -    0s
     0     0    2.66667    0 1066    4.00000    2.66667  33.3%     -    1s
     0     0    2.66667    0 3069    4.00000    2.66667  33.3%     -    2s
     0     0    2.66667    0  277    4.00000    2.66667  33.3%     -    8s
     0     0    2.68263    0 2500    4.00000    2.68263  32.9%     -   14s
     0     0    2.68293    0 2500    4.00000    2.68293  32.9%     -   15s
     0     0    2.68293    0 2451    4.00000    2.68293  32.9%     -   20s
     0     0    2.68293    0 2584    4.00000    2.68293  32.9%     -   23s
     0     0    2.68293    0 2592    4.00000    2.68293  32.9%     -   27s
     0     0    2.68293    0 2529    4.00000    2.68293  32.9%     -   31s
     0     0    2.68293    0 2610    4.00000    2.68293  32.9%     -   35s
     0     0    2.68293    0 2476    4.00000    2.68293  32.9%     -   39s
     0     1    3.00000    0 2467    4.00000    3.00000  25.0%     -   42s

Cutting planes:
  Gomory: 1
  Zero half: 19

Explored 7 nodes (144894 simplex iterations) in 42.89 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%