Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:21:28 2013

Optimize a model with 30910 rows, 30360 columns and 121110 nonzeros
Presolve removed 55 rows and 0 columns
Presolve time: 0.13s
Presolved: 30855 rows, 30360 columns, 121055 nonzeros
Variable types: 30305 continuous, 55 integer (55 binary)

Root relaxation: objective 4.612101e+04, 3790 iterations, 1.39 seconds

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

     0     0 46121.0131    0   47          - 46121.0131     -      -    1s
H    0     0                    61127.000000 46121.0131  24.5%     -    2s
     0     0 51467.7850    0    6 61127.0000 51467.7850  15.8%     -    4s
H    0     0                    55669.388420 51467.7850  7.55%     -    4s
H    0     0                    54953.000000 51467.7850  6.34%     -    4s
     0     0 52399.4412    0    1 54953.0000 52399.4412  4.65%     -    4s
H    0     0                    52942.000000 52399.4412  1.02%     -    4s
H    0     0                    52678.000000 52399.4412  0.53%     -    4s
     0     2 52400.1850    0    1 52678.0000 52400.1850  0.53%     -    5s
*    4     2               3    52507.000000 52501.0000  0.01%   151    5s

Cutting planes:
  Implied bound: 48

Explored 6 nodes (7399 simplex iterations) in 5.75 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.250700000000e+04, best bound 5.250700000000e+04, gap 0.0%