Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:39 2012

Optimize a model with 179 rows, 56 columns and 358 nonzeros
Presolve removed 54 rows and 0 columns
Presolve time: 0.00s
Presolved: 125 rows, 56 columns, 289 nonzeros
Variable types: 0 continuous, 56 integer (56 binary)
Found heuristic solution: objective 19.0000000

Root relaxation: objective 2.283333e+01, 74 iterations, 0.00 seconds

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

     0     0   22.83333    0   51   19.00000   22.83333  20.2%     -    0s
H    0     0                      20.0000000   22.83333  14.2%     -    0s
     0     0   22.00000    0   44   20.00000   22.00000  10.0%     -    0s
     0     0   22.00000    0   51   20.00000   22.00000  10.0%     -    0s
     0     0   22.00000    0   34   20.00000   22.00000  10.0%     -    0s
     0     0   22.00000    0   20   20.00000   22.00000  10.0%     -    0s
H    0     0                      21.0000000   22.00000  4.76%     -    0s
     0     0   22.00000    0   48   21.00000   22.00000  4.76%     -    0s
     0     0   22.00000    0   46   21.00000   22.00000  4.76%     -    0s
     0     2   22.00000    0   46   21.00000   22.00000  4.76%     -    0s

Explored 3 nodes (475 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0%