Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:47:29 2013

Optimize a model with 4280 rows, 8040 columns and 24020 nonzeros
Presolve removed 60 rows and 40 columns
Presolve time: 0.20s
Presolved: 4220 rows, 8000 columns, 19960 nonzeros
Variable types: 6020 continuous, 1980 integer (1980 binary)

Root relaxation: objective 4.642213e+04, 1721 iterations, 0.04 seconds

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

     0     0 46422.1265    0    3          - 46422.1265     -      -    0s
     0     0 46456.1748    0    3          - 46456.1748     -      -    0s
     0     0 46464.8245    0    3          - 46464.8245     -      -    0s
     0     0 46464.8245    0    3          - 46464.8245     -      -    0s
     0     0 46464.8245    0    3          - 46464.8245     -      -    0s
     0     2 46473.8292    0    3          - 46473.8292     -      -    0s
H   46    46                    46789.066746 46475.0929  0.67%  19.2    1s
H   98    86                    46770.440698 46479.7839  0.62%  15.9    1s
H  258   193                    46767.420473 46499.7803  0.57%  11.4    1s
H  600   354                    46755.499300 46518.2775  0.51%  10.1    2s
H  678   381                    46743.805835 46518.2775  0.48%  12.3    3s
  1253   461 46571.5248   26    1 46743.8058 46518.2775  0.48%  11.8    5s
  4973  1755     cutoff   22      46743.8058 46608.0652  0.29%   9.7   10s
  7892  1483     cutoff   28      46743.8058 46663.9650  0.17%  10.6   15s

Cutting planes:
  Gomory: 2
  Flow cover: 6

Explored 10661 nodes (113493 simplex iterations) in 19.96 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.674380583461e+04, best bound 4.673936084239e+04, gap 0.0095%