Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:56:21 2012

Optimize a model with 710 rows, 168 columns and 1420 nonzeros
Presolve removed 143 rows and 2 columns
Presolve time: 0.00s
Presolved: 567 rows, 166 columns, 1221 nonzeros
Variable types: 0 continuous, 166 integer (166 binary)
Found heuristic solution: objective 49.0000000

Root relaxation: objective 6.900000e+01, 300 iterations, 0.01 seconds

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

     0     0   69.00000    0  144   49.00000   69.00000  40.8%     -    0s
     0     0   68.00000    0  156   49.00000   68.00000  38.8%     -    0s
     0     0   67.19048    0  164   49.00000   67.19048  37.1%     -    0s
H    0     0                      50.0000000   67.19048  34.4%     -    0s
     0     0   66.37578    0  166   50.00000   66.37578  32.8%     -    0s
     0     0   65.84894    0  166   50.00000   65.84894  31.7%     -    0s
H    0     0                      52.0000000   65.84894  26.6%     -    0s
     0     0   65.50648    0  166   52.00000   65.50648  26.0%     -    0s
     0     0   65.01248    0  166   52.00000   65.01248  25.0%     -    0s
     0     0   64.85060    0  166   52.00000   64.85060  24.7%     -    0s
     0     0   64.74174    0  166   52.00000   64.74174  24.5%     -    0s
H    0     0                      53.0000000   64.74174  22.2%     -    0s
     0     0   64.66996    0  166   53.00000   64.66996  22.0%     -    0s
     0     0   64.59105    0  166   53.00000   64.59105  21.9%     -    0s
     0     0   64.50022    0  166   53.00000   64.50022  21.7%     -    0s
     0     0   64.37967    0  166   53.00000   64.37967  21.5%     -    0s
     0     0   64.22835    0  163   53.00000   64.22835  21.2%     -    0s
     0     0   64.10070    0  165   53.00000   64.10070  20.9%     -    0s
     0     0   64.03036    0  165   53.00000   64.03036  20.8%     -    0s
     0     0   64.00769    0  165   53.00000   64.00769  20.8%     -    0s
     0     0   64.00769    0  164   53.00000   64.00769  20.8%     -    0s
     0     2   64.00618    0  163   53.00000   64.00618  20.8%     -    0s
*  254   139              15      54.0000000   62.17113  15.1%  45.9    0s
   717   401   57.28571   28  122   54.00000   61.35937  13.6%  49.2    5s
  4180  1744   56.00000   29   76   54.00000   59.50000  10.2%  31.8   10s
* 5590  1834              29      55.0000000   59.07143  7.40%  29.4   11s
* 7398  1151              23      56.0000000   58.42500  4.33%  28.1   13s

Cutting planes:
  Gomory: 5
  Zero half: 84

Explored 9213 nodes (243519 simplex iterations) in 14.86 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%