Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:20 2012

Optimize a model with 688 rows, 53 columns and 1376 nonzeros
Presolve removed 467 rows and 0 columns
Presolve time: 0.01s
Presolved: 221 rows, 53 columns, 1235 nonzeros
Variable types: 0 continuous, 53 integer (53 binary)
Found heuristic solution: objective 7.0000000

Root relaxation: objective 9.869944e+00, 96 iterations, 0.00 seconds

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

     0     0    9.86994    0   45    7.00000    9.86994  41.0%     -    0s
     0     0    9.39465    0   49    7.00000    9.39465  34.2%     -    0s
     0     0    9.31740    0   49    7.00000    9.31740  33.1%     -    0s
H    0     0                       8.0000000    9.31740  16.5%     -    0s
     0     0    9.30393    0   48    8.00000    9.30393  16.3%     -    0s
     0     0    9.28822    0   50    8.00000    9.28822  16.1%     -    0s
     0     0    9.27661    0   50    8.00000    9.27661  16.0%     -    0s
     0     0    9.25894    0   50    8.00000    9.25894  15.7%     -    0s
     0     0    9.25388    0   50    8.00000    9.25388  15.7%     -    0s
     0     0    9.25329    0   50    8.00000    9.25329  15.7%     -    0s
     0     0    9.25302    0   50    8.00000    9.25302  15.7%     -    0s
     0     2    9.24469    0   50    8.00000    9.24469  15.6%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 21
  Zero half: 5
  Mod-K: 1

Explored 5 nodes (407 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%