Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:08:16 2013

Optimize a model with 23616 rows, 23136 columns and 92256 nonzeros
Presolve removed 48 rows and 0 columns
Presolve time: 0.10s
Presolved: 23568 rows, 23136 columns, 92208 nonzeros
Variable types: 23088 continuous, 48 integer (48 binary)

Root relaxation: objective 4.326307e+04, 3203 iterations, 0.84 seconds

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

     0     0 43263.0704    0   43          - 43263.0704     -      -    1s
H    0     0                    61939.000000 43263.0704  30.2%     -    1s
     0     0 53019.0389    0    4 61939.0000 53019.0389  14.4%     -    3s
H    0     0                    55242.975415 53019.0389  4.03%     -    3s
H    0     0                    54525.000000 53019.0389  2.76%     -    3s
     0     0 54184.8003    0    4 54525.0000 54184.8003  0.62%     -    3s
H    0     0                    54449.000000 54184.8003  0.49%     -    3s
     0     2 54186.9537    0    4 54449.0000 54186.9537  0.48%     -    3s
*   10     3               8    54446.000000 54314.9901  0.24%  94.8    4s

Cutting planes:
  Implied bound: 44

Explored 16 nodes (7159 simplex iterations) in 4.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.444600000000e+04, best bound 5.444600000000e+04, gap 0.0%