Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:21 2013

Optimize a model with 52 rows, 312 columns and 1906 nonzeros
Presolve removed 22 rows and 80 columns
Presolve time: 0.00s
Presolved: 30 rows, 232 columns, 1662 nonzeros
Variable types: 220 continuous, 12 integer (12 binary)
Found heuristic solution: objective 4831.4700387

Root relaxation: objective 4.810927e+03, 14 iterations, 0.00 seconds

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

     0     0 4810.92679    0    6 4831.47004 4810.92679  0.43%     -    0s
     0     0 4829.05735    0   10 4831.47004 4829.05735  0.05%     -    0s
     0     0 4829.05735    0    4 4831.47004 4829.05735  0.05%     -    0s
     0     0 4829.18521    0   10 4831.47004 4829.18521  0.05%     -    0s
     0     0 4829.25962    0   10 4831.47004 4829.25962  0.05%     -    0s
     0     0 4829.25962    0   10 4831.47004 4829.25962  0.05%     -    0s
     0     0 4829.90389    0    5 4831.47004 4829.90389  0.03%     -    0s
     0     2 4829.94236    0    5 4831.47004 4829.94236  0.03%     -    0s
*    2     1               2    4831.1134685 4830.80949  0.01%   2.5    0s

Cutting planes:
  Gomory: 3
  Implied bound: 2
  Flow cover: 2

Explored 3 nodes (123 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.831113468497e+03, best bound 4.830809490581e+03, gap 0.0063%