Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:52:09 2012

Optimize a model with 31 rows, 24 columns and 99 nonzeros
Presolve time: 0.00s
Presolved: 31 rows, 24 columns, 99 nonzeros
Variable types: 0 continuous, 24 integer (24 binary)
Found heuristic solution: objective 7.0000000

Root relaxation: objective 0.000000e+00, 12 iterations, 0.00 seconds

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

     0     0    0.00000    0    9    7.00000    0.00000   100%     -    0s
     0     0    0.72000    0   12    7.00000    0.72000  89.7%     -    0s
     0     0    0.88889    0   11    7.00000    0.88889  87.3%     -    0s
     0     0    0.90253    0   16    7.00000    0.90253  87.1%     -    0s
     0     0    1.00000    0   17    7.00000    1.00000  85.7%     -    0s
     0     0    1.00000    0   12    7.00000    1.00000  85.7%     -    0s
     0     0    1.06356    0   20    7.00000    1.06356  84.8%     -    0s
H    0     0                       6.0000000    1.06356  82.3%     -    0s
     0     0    1.06636    0   19    6.00000    1.06636  82.2%     -    0s
     0     0    1.10121    0   20    6.00000    1.10121  81.6%     -    0s
     0     0    1.10705    0   22    6.00000    1.10705  81.5%     -    0s
     0     2    1.12240    0   22    6.00000    1.12240  81.3%     -    0s
*    3     3               2       4.0000000    3.00000  25.0%  12.3    0s

Cutting planes:
  Gomory: 1
  Zero half: 1
  Mod-K: 6

Explored 5 nodes (117 simplex iterations) in 0.01 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%