ns   x1   x2   x3   x4   x5 cost  npv   comment 
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    0    0    0    0    0    0    0    0           
    1    0    0    0    0    1  150  100           
    2    0    0    0    1    0  150   50           
    3    0    0    0    1    1  300  150           
    4    0    0    1    0    0  200  100           
    5    0    0    1    0    1  350  200           
    6    0    0    1    1    0  350  150           
    7    0    0    1    1    1  500  250           
    8    0    1    0    0    0  300  200           
    9    0    1    0    0    1  450  300           
   10    0    1    0    1    0  450  250           
   11    0    1    0    1    1  600  350           
   12    0    1    1    0    0  500  300           
   13    0    1    1    0    1  650  400  cost>600 
   14    0    1    1    1    0  650  350  cost>600 
   15    0    1    1    1    1  800  450  cost>600 
   16    1    0    0    0    0  100  100           
   17    1    0    0    0    1  250  200           
   18    1    0    0    1    0  250  150           
   19    1    0    0    1    1  400  250           
   20    1    0    1    0    0  300  200           
   21    1    0    1    0    1  450  300           
   22    1    0    1    1    0  450  250           
   23    1    0    1    1    1  600  350           
   24    1    1    0    0    0  400  300           
   25    1    1    0    0    1  550  400   optimal 
   26    1    1    0    1    0  550  350           
   27    1    1    0    1    1  700  450  cost>600 
   28    1    1    1    0    0  600  400   optimal 
   29    1    1    1    0    1  750  500  cost>600 
   30    1    1    1    1    0  750  450  cost>600 
   31    1    1    1    1    1  900  550  cost>600 
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