Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:27:15 2013

Optimize a model with 1700 rows, 51827 columns and 2499477 nonzeros
Presolve removed 46 rows and 379 columns (presolve time = 5s) ...
Presolve removed 48 rows and 413 columns
Presolve time: 8.50s
Presolved: 1652 rows, 51414 columns, 2474851 nonzeros
Variable types: 0 continuous, 51414 integer (51414 binary)
Found heuristic solution: objective 24610.000000

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    8874    1.8121220e+04   3.810792e+02   0.000000e+00      5s
   13214    1.8284434e+04   1.141302e+03   0.000000e+00     10s
   16934    1.8313268e+04   2.005200e+02   0.000000e+00     15s
   18170    1.8319000e+04   0.000000e+00   0.000000e+00     18s

Root relaxation: objective 1.831900e+04, 18170 iterations, 17.97 seconds

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

     0     0 18319.0000    0  116 24610.0000 18319.0000  25.6%     -   27s
H    0     0                    19547.000000 18319.0000  6.28%     -   35s
     0     0 18323.2500    0   96 19547.0000 18323.2500  6.26%     -   38s
H    0     0                    18696.000000 18323.2500  1.99%     -   39s
*    0     0               0    18327.000000 18327.0000   0.0%     -   42s

Cutting planes:
  Clique: 7
  Zero half: 16

Explored 0 nodes (19830 simplex iterations) in 42.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.832700000000e+04, best bound 1.832700000000e+04, gap 0.0%