Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:08:09 2012

Optimize a model with 826 rows, 173 columns and 1652 nonzeros
Presolve removed 207 rows and 0 columns
Presolve time: 0.00s
Presolved: 619 rows, 173 columns, 1375 nonzeros
Variable types: 0 continuous, 173 integer (173 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 6.752174e+01, 438 iterations, 0.01 seconds

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

     0     0   67.52174    0  167   48.00000   67.52174  40.7%     -    0s
H    0     0                      49.0000000   67.52174  37.8%     -    0s
     0     0   66.65415    0  172   49.00000   66.65415  36.0%     -    0s
H    0     0                      51.0000000   66.65415  30.7%     -    0s
     0     0   66.11769    0  170   51.00000   66.11769  29.6%     -    0s
     0     0   65.60826    0  173   51.00000   65.60826  28.6%     -    0s
     0     0   65.19480    0  173   51.00000   65.19480  27.8%     -    0s
     0     0   64.92295    0  173   51.00000   64.92295  27.3%     -    0s
     0     0   64.82330    0  173   51.00000   64.82330  27.1%     -    0s
     0     0   64.55296    0  172   51.00000   64.55296  26.6%     -    0s
H    0     0                      52.0000000   64.55296  24.1%     -    0s
     0     0   64.38583    0  172   52.00000   64.38583  23.8%     -    0s
     0     0   64.20452    0  170   52.00000   64.20452  23.5%     -    0s
     0     0   64.08552    0  172   52.00000   64.08552  23.2%     -    0s
     0     0   63.93789    0  172   52.00000   63.93789  23.0%     -    0s
     0     0   63.83191    0  171   52.00000   63.83191  22.8%     -    0s
     0     0   63.66663    0  172   52.00000   63.66663  22.4%     -    0s
     0     0   63.60742    0  170   52.00000   63.60742  22.3%     -    0s
     0     0   63.54857    0  171   52.00000   63.54857  22.2%     -    0s
     0     0   63.51517    0  171   52.00000   63.51517  22.1%     -    0s
     0     0   63.51517    0  171   52.00000   63.51517  22.1%     -    0s
     0     2   63.51469    0  171   52.00000   63.51469  22.1%     -    0s
*   12    12               6      54.0000000   63.41883  17.4%  78.7    0s
   613   264   60.79502   10  172   54.00000   61.26564  13.5%  46.5    5s
H 1551   484                      55.0000000   60.77778  10.5%  48.5    7s
  2363   799   56.18182   30  121   55.00000   59.95455  9.01%  44.5   10s
  5610  1176   56.81395   24  125   55.00000   58.22549  5.86%  37.1   15s

Cutting planes:
  Gomory: 1
  Zero half: 87

Explored 9823 nodes (320875 simplex iterations) in 19.89 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%