Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:13:33 2012

Optimize a model with 499 rows, 459 columns and 1704 nonzeros
Presolve removed 0 rows and 30 columns
Presolve time: 0.00s
Presolved: 499 rows, 429 columns, 1674 nonzeros
Variable types: 0 continuous, 429 integer (428 binary)
Found heuristic solution: objective 84.0000000

Root relaxation: objective 0.000000e+00, 275 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  175   84.00000    0.00000   100%     -    0s
H    0     0                      75.0000000    0.00000   100%     -    0s
H    0     0                      73.0000000    0.00000   100%     -    0s
H    0     0                      69.0000000    0.00000   100%     -    0s
     0     0    0.40000    0  176   69.00000    0.40000  99.4%     -    0s
H    0     0                      59.0000000    0.40000  99.3%     -    0s
H    0     0                      57.0000000    0.40000  99.3%     -    0s
     0     0    1.11970    0  180   57.00000    1.11970  98.0%     -    0s
H    0     0                      53.0000000    1.11970  97.9%     -    0s
H    0     0                      46.0000000    1.11970  97.6%     -    0s
     0     2    1.12482    0  180   46.00000    1.12482  97.6%     -    0s
H   54    49                      23.0000000    2.39795  89.6%  29.5    0s
*  469   193              20      22.0000000   10.23364  53.5%  28.2    0s
H 1215   226                      21.0000000   12.14000  42.2%  28.4    1s
H 2166   192                      20.0000000   15.47059  22.6%  26.8    3s

Explored 2621 nodes (68652 simplex iterations) in 4.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%