Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:38:18 2012

Optimize a model with 281 rows, 219 columns and 919 nonzeros
Presolve time: 0.00s
Presolved: 281 rows, 219 columns, 919 nonzeros
Variable types: 0 continuous, 219 integer (219 binary)
Found heuristic solution: objective 53.0000000

Root relaxation: objective 0.000000e+00, 105 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   78   53.00000    0.00000   100%     -    0s
H    0     0                      44.0000000    0.00000   100%     -    0s
     0     0    0.36173    0   80   44.00000    0.36173  99.2%     -    0s
H    0     0                      40.0000000    0.36173  99.1%     -    0s
     0     0    1.02302    0   83   40.00000    1.02302  97.4%     -    0s
H    0     0                      38.0000000    1.02302  97.3%     -    0s
     0     0    1.02404    0   84   38.00000    1.02404  97.3%     -    0s
     0     0    1.02404    0   84   38.00000    1.02404  97.3%     -    0s
H    0     0                      31.0000000    1.02404  96.7%     -    0s
     0     2    1.02757    0   84   31.00000    1.02757  96.7%     -    0s
*   28    28              18      26.0000000    3.78183  85.5%  41.5    0s
*   35    27              20      25.0000000    3.78183  84.9%  33.7    0s
*   63    42              18      24.0000000    4.95654  79.3%  28.4    0s
*   94    52              20      22.0000000    6.06768  72.4%  24.8    0s
*  171    74              11      20.0000000    8.20694  59.0%  22.7    0s
*  419    81              15      19.0000000   11.03980  41.9%  21.8    0s

Cutting planes:
  Gomory: 4
  Mod-K: 1

Explored 871 nodes (17031 simplex iterations) in 0.60 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%