Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:56:22 2013

Optimize a model with 27775 rows, 3025 columns and 84700 nonzeros
Presolve removed 4395 rows and 1574 columns
Presolve time: 0.19s
Presolved: 23380 rows, 1451 columns, 71385 nonzeros
Variable types: 24 continuous, 1427 integer (1427 binary)
Found heuristic solution: objective 63326.000000

Root relaxation: objective 4.910889e+04, 7079 iterations, 0.46 seconds

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

     0     0 49108.8889    0    8 63326.0000 49108.8889  22.5%     -    0s
H    0     0                    49121.000000 49108.8889  0.02%     -    0s
H    0     0                    49118.000000 49108.8889  0.02%     -    0s
H    0     0                    49114.000000 49108.8889  0.01%     -    0s
     0     0 49108.8889    0   17 49114.0000 49108.8889  0.01%     -    0s
     0     0 49108.8889    0    9 49114.0000 49108.8889  0.01%     -    1s
     0     0 49108.9166    0   24 49114.0000 49108.9166  0.01%     -    1s
     0     0 49109.0331    0   28 49114.0000 49109.0331  0.01%     -    1s
     0     0 49109.3212    0   30 49114.0000 49109.3212  0.01%     -    1s

Cutting planes:
  Gomory: 1
  Cover: 1
  Implied bound: 4
  MIR: 17
  Mod-K: 2

Explored 0 nodes (7640 simplex iterations) in 1.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.911400000000e+04, best bound 4.911000000000e+04, gap 0.0081%