Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:41 2012

Optimize a model with 550 rows, 147 columns and 1100 nonzeros
Presolve removed 111 rows and 0 columns
Presolve time: 0.00s
Presolved: 439 rows, 147 columns, 950 nonzeros
Variable types: 0 continuous, 147 integer (147 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 6.100000e+01, 254 iterations, 0.00 seconds

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

     0     0   61.00000    0  110   45.00000   61.00000  35.6%     -    0s
H    0     0                      47.0000000   61.00000  29.8%     -    0s
     0     0   60.30726    0  143   47.00000   60.30726  28.3%     -    0s
H    0     0                      49.0000000   60.30726  23.1%     -    0s
     0     0   59.25490    0  144   49.00000   59.25490  20.9%     -    0s
     0     0   58.59044    0  145   49.00000   58.59044  19.6%     -    0s
     0     0   58.31506    0  145   49.00000   58.31506  19.0%     -    0s
     0     0   58.02687    0  146   49.00000   58.02687  18.4%     -    0s
     0     0   57.48815    0  146   49.00000   57.48815  17.3%     -    0s
     0     0   57.34879    0  147   49.00000   57.34879  17.0%     -    0s
     0     0   57.32558    0  147   49.00000   57.32558  17.0%     -    0s
     0     0   57.32558    0  146   49.00000   57.32558  17.0%     -    0s
H    0     0                      50.0000000   57.32558  14.7%     -    0s
     0     2   57.32350    0  145   50.00000   57.32350  14.6%     -    0s
H   43    21                      51.0000000   56.92217  11.6%  37.1    0s
H   45    20                      52.0000000   56.92217  9.47%  36.2    0s

Cutting planes:
  Gomory: 1
  Zero half: 104

Explored 610 nodes (19805 simplex iterations) in 0.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%