Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:21:25 2012

Optimize a model with 527 rows, 477 columns and 1792 nonzeros
Presolve removed 0 rows and 15 columns
Presolve time: 0.00s
Presolved: 527 rows, 462 columns, 1777 nonzeros
Variable types: 0 continuous, 462 integer (461 binary)
Found heuristic solution: objective 101.0000000

Root relaxation: objective 0.000000e+00, 276 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  196  101.00000    0.00000   100%     -    0s
H    0     0                      69.0000000    0.00000   100%     -    0s
     0     0    0.51812    0  197   69.00000    0.51812  99.2%     -    0s
H    0     0                      49.0000000    0.51812  98.9%     -    0s
     0     0    1.20411    0  199   49.00000    1.20411  97.5%     -    0s
H    0     0                      33.0000000    1.20411  96.4%     -    0s
     0     0    1.53083    0  199   33.00000    1.53083  95.4%     -    0s
H    0     0                      30.0000000    1.53083  94.9%     -    0s
     0     0    1.53343    0  201   30.00000    1.53343  94.9%     -    0s
     0     0    1.53343    0  201   30.00000    1.53343  94.9%     -    0s
     0     2    1.55179    0  201   30.00000    1.55179  94.8%     -    0s
*   52    37              28      21.0000000    3.59125  82.9%  33.6    0s
H  590   160                      20.0000000   12.89744  35.5%  27.0    0s
H 1991   251                      19.0000000   14.31724  24.6%  28.7    2s

Explored 3209 nodes (91776 simplex iterations) in 4.49 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0%