Gurobi 5.0.1 (linux64) logging started Wed Dec 19 20:26:17 2012

Optimize a model with 3842 rows, 3721 columns and 22496 nonzeros
Presolve removed 1615 rows and 1814 columns
Presolve time: 0.08s
Presolved: 2227 rows, 1907 columns, 20931 nonzeros
Variable types: 60 continuous, 1847 integer (1847 binary)

Root relaxation: objective 4.697489e+02, 380 iterations, 0.01 seconds

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

     0     0  469.74890    0   87          -  469.74890     -      -    0s
     0     0  484.42584    0   97          -  484.42584     -      -    0s
     0     0  496.62164    0   81          -  496.62164     -      -    0s
     0     0  496.75058    0   94          -  496.75058     -      -    0s
     0     0  496.75438    0   94          -  496.75438     -      -    0s
     0     0  505.93110    0   82          -  505.93110     -      -    0s
     0     0  508.27279    0  102          -  508.27279     -      -    0s
     0     0  509.21721    0  102          -  509.21721     -      -    0s
     0     0  509.21721    0  102          -  509.21721     -      -    0s
     0     2  509.32665    0  102          -  509.32665     -      -    0s
   617   433  562.77776   38  105          -  528.09020     -    9.8    5s
H  618   411                     553.0000000  528.09020  4.50%   9.8    5s
H  646   409                     541.0000000  528.16199  2.37%  12.3    6s
*  680   387              33     540.0000000  529.39293  1.96%  12.5    6s
H  729   356                     539.0000000  529.72838  1.72%  12.7    6s

Cutting planes:
  Learned: 6
  Gomory: 55
  Cover: 26
  Implied bound: 3
  Clique: 5
  MIR: 91
  GUB cover: 23
  Zero half: 58

Explored 1086 nodes (16628 simplex iterations) in 7.41 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.390000000000e+02, best bound 5.390000000000e+02, gap 0.0%