#Program created by Oxylane

#Works on Python2.7

def npv():

 investment = raw_input("Investment = ")

 cashflow = [int(investment) * -1]

 interest = raw_input("Interest = ")

 year = raw_input("Year = ")

 i = 1

 

 while (i <= int(year)):

 cashflow.extend([raw_input("Cashflow year %d = " % i)])

 cashflow[i] = int(cashflow[i])

 i += 1



 investment = int(investment)

 interest = float(interest)

 year = int(year)

 pv = [cashflow[0]]

 i = 1

 while (i <= year):

 #insert dummy data to pv

 pv.extend([0])

 i += 1



 i = 1

 while (i <= year):

 #calculate the NPV each year

 pv[i] = cashflow[i] / ((1 + interest) ** i)

 i += 1



 i = 0

 hasil = 0

 while (i <= year):

 #sum NPV each year

 hasil = hasil + pv[i]

 i += 1



 print("NPV = " + str(hasil) + "\n")

 if (float(hasil) < 0):

 print "Because NPV < 0, it would be better if investment to be cancelled"

 else:

 print "Because NPV > 0, it would be better if we doing this investment"



npv()