Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:04:47 2013

Optimize a model with 506 rows, 21206 columns and 42366 nonzeros
Presolve time: 0.03s
Presolved: 506 rows, 21206 columns, 42366 nonzeros
Variable types: 21160 continuous, 46 integer (46 binary)

Root relaxation: objective 5.483603e+04, 1353 iterations, 0.03 seconds

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

     0     0 54836.0309    0    6          - 54836.0309     -      -    0s
H    0     0                    55899.000000 54836.0309  1.90%     -    0s
H    0     0                    55231.000000 54836.0309  0.72%     -    0s
     0     0 55136.0357    0    4 55231.0000 55136.0357  0.17%     -    0s
     0     0 55136.0357    0    6 55231.0000 55136.0357  0.17%     -    0s
     0     0 55136.0357    0    4 55231.0000 55136.0357  0.17%     -    0s
     0     0 55147.9521    0    4 55231.0000 55147.9521  0.15%     -    0s
     0     0 55154.3036    0    4 55231.0000 55154.3036  0.14%     -    0s
     0     0 55163.2842    0    4 55231.0000 55163.2842  0.12%     -    0s
     0     0 55163.2842    0    4 55231.0000 55163.2842  0.12%     -    0s
     0     0 55163.2842    0    4 55231.0000 55163.2842  0.12%     -    0s
     0     0 55163.2842    0    4 55231.0000 55163.2842  0.12%     -    0s
     0     0 55211.8651    0    2 55231.0000 55211.8651  0.03%     -    0s
     0     2 55213.3651    0    2 55231.0000 55213.3651  0.03%     -    0s

Cutting planes:
  Implied bound: 53
  Flow cover: 2

Explored 3 nodes (3045 simplex iterations) in 0.54 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.523100000000e+04, best bound 5.522840909091e+04, gap 0.0047%