Gurobi 5.0.1 (linux64) logging started Sat Nov 17 19:52:35 2012

Optimize a model with 87 rows, 58 columns and 273 nonzeros
Presolve time: 0.00s
Presolved: 87 rows, 58 columns, 273 nonzeros
Variable types: 0 continuous, 58 integer (58 binary)
Found heuristic solution: objective 21.0000000

Root relaxation: objective 0.000000e+00, 22 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   15   21.00000    0.00000   100%     -    0s
     0     0    0.90864    0   26   21.00000    0.90864  95.7%     -    0s
     0     0    1.07527    0   32   21.00000    1.07527  94.9%     -    0s
H    0     0                      19.0000000    1.07527  94.3%     -    0s
     0     0    1.10108    0   29   19.00000    1.10108  94.2%     -    0s
     0     0    1.26892    0   27   19.00000    1.26892  93.3%     -    0s
H    0     0                      15.0000000    1.26892  91.5%     -    0s
     0     0    1.34615    0   25   15.00000    1.34615  91.0%     -    0s
     0     0    1.46352    0   30   15.00000    1.46352  90.2%     -    0s
     0     0    1.50962    0   29   15.00000    1.50962  89.9%     -    0s
     0     0    1.53388    0   36   15.00000    1.53388  89.8%     -    0s
     0     2    1.64103    0   36   15.00000    1.64103  89.1%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 8
  Mod-K: 4

Explored 37 nodes (689 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.500000000000e+01, best bound 1.500000000000e+01, gap 0.0%