year_tax_for_basketball=float(input())
basketball_snickers=year_tax_for_basketball-((year_tax_for_basketball*40)/100)
basketball_suit=basketball_snickers-((basketball_snickers*20)/100)
ball=basketball_suit/4
basketball_accessories=ball/5
total_price=year_tax_for_basketball+basketball_snickers+basketball_suit+ball+basketball_accessories
print(total_price)