Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:09:02 2013

Optimize a model with 47056 rows, 46376 columns and 185096 nonzeros
Presolve removed 68 rows and 0 columns
Presolve time: 0.21s
Presolved: 46988 rows, 46376 columns, 185028 nonzeros
Variable types: 46308 continuous, 68 integer (68 binary)

Root relaxation: objective 6.003025e+04, 6162 iterations, 3.84 seconds

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

     0     0 60030.2450    0   51          - 60030.2450     -      -    4s
H    0     0                    95384.000000 60030.2450  37.1%     -    8s
     0     0 80401.7326    0   17 95384.0000 80401.7326  15.7%     -   14s
H    0     0                    92520.000000 80401.7326  13.1%     -   14s
H    0     0                    91712.000000 80401.7326  12.3%     -   15s
     0     0 83697.3539    0    8 91712.0000 83697.3539  8.74%     -   16s
     0     0 83802.5518    0    4 91712.0000 83802.5518  8.62%     -   16s
H    0     0                    85678.988356 83802.5518  2.19%     -   17s
H    0     0                    85443.000000 83802.5518  1.92%     -   17s
     0     2 83808.4187    0    4 85443.0000 83808.4187  1.91%     -   18s
H    1     1                    84543.828571 83808.4187  0.87%   0.0   18s
H    3     3                    83910.000000 83822.4000  0.10%  34.7   18s
H    4     3                    83872.800000 83824.9600  0.06%  44.8   18s
*    9     4               8    83852.000000 83831.3453  0.02%  38.0   18s

Cutting planes:
  Gomory: 1
  Implied bound: 66
  MIR: 1

Explored 15 nodes (14467 simplex iterations) in 18.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.385200000000e+04, best bound 8.385016000000e+04, gap 0.0022%