Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:21 2013

Optimize a model with 52 rows, 312 columns and 1906 nonzeros
Presolve removed 22 rows and 89 columns
Presolve time: 0.00s
Presolved: 30 rows, 223 columns, 1644 nonzeros
Variable types: 211 continuous, 12 integer (12 binary)
Found heuristic solution: objective 5456.4051803

Root relaxation: objective 5.420106e+03, 12 iterations, 0.00 seconds

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

     0     0 5420.10604    0    3 5456.40518 5420.10604  0.67%     -    0s
     0     0 5439.57455    0    5 5456.40518 5439.57455  0.31%     -    0s
     0     0 5439.57455    0    2 5456.40518 5439.57455  0.31%     -    0s
     0     0 5439.71419    0    5 5456.40518 5439.71419  0.31%     -    0s
     0     0 5439.78542    0    5 5456.40518 5439.78542  0.30%     -    0s
     0     0 5439.78542    0    5 5456.40518 5439.78542  0.30%     -    0s
     0     2 5440.20415    0    5 5456.40518 5440.20415  0.30%     -    0s
*    9     3               7    5442.4738070 5440.93890  0.03%   2.1    0s
*   15     3               5    5441.6157041 5441.57493  0.00%   2.0    0s

Cutting planes:
  Gomory: 1
  Implied bound: 2
  Flow cover: 2

Explored 16 nodes (106 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.441615704088e+03, best bound 5.441574930407e+03, gap 0.0007%