Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:58:17 2013

Optimize a model with 36050 rows, 3600 columns and 109800 nonzeros
Presolve removed 2790 rows and 1812 columns
Presolve time: 0.28s
Presolved: 33260 rows, 1788 columns, 101830 nonzeros
Variable types: 36 continuous, 1752 integer (1752 binary)
Found heuristic solution: objective 81725.000000

Root relaxation: objective 5.582212e+04, 25342 iterations, 2.01 seconds

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

     0     0 55822.1176    0   11 81725.0000 55822.1176  31.7%     -    2s
H    0     0                    55836.000000 55822.1176  0.02%     -    2s
H    0     0                    55831.000000 55822.1176  0.02%     -    2s
     0     0 55823.0000    0   28 55831.0000 55823.0000  0.01%     -    2s
     0     0 55823.0000    0   13 55831.0000 55823.0000  0.01%     -    3s
     0     0 55823.0000    0   29 55831.0000 55823.0000  0.01%     -    3s
     0     2 55823.0000    0   29 55831.0000 55823.0000  0.01%     -    3s
H    1     2                    55830.000000 55823.0000  0.01%   185    3s
H   33    15                    55828.000000 55823.0000  0.01%   128    4s

Cutting planes:
  Gomory: 5
  MIR: 21
  Zero half: 6

Explored 33 nodes (33942 simplex iterations) in 4.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.582800000000e+04, best bound 5.582300000000e+04, gap 0.0090%