Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:46:50 2013

Optimize a model with 40446 rows, 39816 columns and 158886 nonzeros
Presolve removed 63 rows and 0 columns
Presolve time: 0.17s
Presolved: 40383 rows, 39816 columns, 158823 nonzeros
Variable types: 39753 continuous, 63 integer (63 binary)

Root relaxation: objective 5.801831e+04, 5697 iterations, 3.31 seconds

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

     0     0 58018.3147    0   52          - 58018.3147     -      -    3s
H    0     0                    91608.000000 58018.3147  36.7%     -    5s
     0     0 74070.8595    0   14 91608.0000 74070.8595  19.1%     -   11s
H    0     0                    84285.000000 74070.8595  12.1%     -   11s
     0     0 77010.6000    0    1 84285.0000 77010.6000  8.63%     -   11s
H    0     0                    77586.266667 77010.6000  0.74%     -   11s
H    0     0                    77252.000000 77010.6000  0.31%     -   11s
H    0     0                    77221.000000 77010.6000  0.27%     -   12s
     0     2 77013.3500    0    1 77221.0000 77013.3500  0.27%     -   12s
H    4     2                    77155.789474 77025.5263  0.17%  63.0   12s
H   27     5                    77117.000000 77061.2500  0.07%  79.0   14s
*   28     4               8    77091.000000 77074.4329  0.02%  78.8   14s

Cutting planes:
  Implied bound: 60

Explored 34 nodes (13629 simplex iterations) in 14.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.709100000000e+04, best bound 7.709100000000e+04, gap 0.0%