Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:40 2013

Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros
Presolve removed 1940 rows and 0 columns
Presolve time: 0.18s
Presolved: 30036 rows, 31416 columns, 121616 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 6.169895e+04, 5710 iterations, 0.66 seconds

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

     0     0 61698.9521    0    4          - 61698.9521     -      -    0s
H    0     0                    62816.000000 61698.9521  1.78%     -    1s
H    0     0                    62336.000000 61698.9521  1.02%     -    1s
     0     0 61701.8916    0    6 62336.0000 61701.8916  1.02%     -    1s
H    0     0                    62090.000000 61701.8916  0.63%     -    1s
     0     0 61701.9944    0    6 62090.0000 61701.9944  0.62%     -    1s
H    0     0                    61911.000000 61701.9944  0.34%     -    2s
     0     0 61701.9944    0    2 61911.0000 61701.9944  0.34%     -    2s
     0     0 61702.2906    0    5 61911.0000 61702.2906  0.34%     -    2s
     0     2 61707.6341    0    5 61911.0000 61707.6341  0.33%     -    3s
*   10     1               3    61889.000000 61788.6715  0.16%  65.1    3s

Cutting planes:
  Gomory: 2

Explored 12 nodes (8763 simplex iterations) in 3.69 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.188900000000e+04, best bound 6.188900000000e+04, gap 0.0%