Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:21:55 2012

Optimize a model with 7649 rows, 2550 columns and 25248 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.14s
Presolved: 7697 rows, 2548 columns, 27442 nonzeros
Variable types: 0 continuous, 2548 integer (2548 binary)
Found heuristic solution: objective 50.0000000

Root relaxation: objective 2.000000e+00, 2053 iterations, 0.06 seconds

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

     0     0    2.00000    0  100   50.00000    2.00000  96.0%     -    0s
H    0     0                      34.0000000    2.00000  94.1%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    3.00000    0 1174    5.00000    3.00000  40.0%     -    1s
     0     0    3.00000    0 1683    5.00000    3.00000  40.0%     -    1s
     0     0    3.00000    0  111    5.00000    3.00000  40.0%     -    4s
     0     0    3.01053    0 1584    5.00000    3.01053  39.8%     -    6s
H    0     0                       4.0000000    3.01053  24.7%     -    7s

Cutting planes:
  Clique: 19

Explored 0 nodes (40254 simplex iterations) in 7.00 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%