Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:06:15 2012

Optimize a model with 5243 rows, 2450 columns and 17983 nonzeros
Presolve removed 932 rows and 49 columns
Presolve time: 0.12s
Presolved: 4311 rows, 2401 columns, 15827 nonzeros
Variable types: 0 continuous, 2401 integer (2401 binary)
Found heuristic solution: objective 31.0000000

Root relaxation: objective 3.000000e+00, 4268 iterations, 0.34 seconds

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

     0     0    3.00000    0   94   31.00000    3.00000  90.3%     -    1s
H    0     0                       4.0000000    3.00000  25.0%     -    1s
     0     0    3.00000    0  103    4.00000    3.00000  25.0%     -    1s
     0     0    3.00000    0  127    4.00000    3.00000  25.0%     -    3s
     0     0    3.00000    0   56    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0   58    4.00000    3.00000  25.0%     -    5s
     0     0    3.00000    0   76    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   77    4.00000    3.00000  25.0%     -    6s
     0     0    3.00000    0   77    4.00000    3.00000  25.0%     -    7s
     0     2    3.00000    0   77    4.00000    3.00000  25.0%     -    8s
     4     4    3.00000    1   50    4.00000    3.00000  25.0%  1212   10s
     8     7    3.00000    1   67    4.00000    3.00000  25.0%   606   15s

Explored 21 nodes (113851 simplex iterations) in 17.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%