Salinity to ABV

# Inputs Original and Final Salinity in Per mille (‰ )
# Outputs Final ABV
# Produced 24/09/2016

def salinity2brix(salinity):
    Brix = 1.187*salinity
    return Brix


OS = int(input('What was your original Salinity reading?'))/10
FS = int(input('What is your final salinity reading?'))/10
OB = salinity2brix(OS)
FB = salinity2brix(FS)
OG = (OB / (258.6-((OB / 258.2)*227.1))) + 1
FG = 1.001843 - 0.002318474*OB - 0.000007775*OB*OB - 0.000000034*OB*OB*OB + 0.00574*FB + 0.00003344*FB*FB + 0.000000086*FB*FB*FB
abv = (OG - FG) *131.25100
print("your ABV is ~", abv)
print("Your original Brix were: ", OB,"\nGiving an original gravity of ", OG, "\nYour final Brix were: ", FB, "\nGiving a final Gravity of ", FG)