Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:31:59 2012

Optimize a model with 73 rows, 58 columns and 146 nonzeros
Presolve removed 38 rows and 32 columns
Presolve time: 0.00s
Presolved: 35 rows, 26 columns, 70 nonzeros
Variable types: 0 continuous, 26 integer (26 binary)
Found heuristic solution: objective 31.0000000

Root relaxation: objective 3.200000e+01, 32 iterations, 0.00 seconds

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

     0     0   32.00000    0   26   31.00000   32.00000  3.23%     -    0s
     0     0 infeasible    0        31.00000   31.99997  3.23%     -    0s

Explored 0 nodes (48 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%