题解 | #网购#
网购
https://www.nowcoder.com/practice/5d7dfd405e5f4e4fbfdff6862c46b751
price, month, day, has_coupon = input().split()
if month+day == "1111":
discount = 0.7
else :
discount = 0.8
if(has_coupon == "1"):
cut = 50
else:
cut = 0
cost = float(price)*discount - cut
print("%.2f" %(cost if cost >= 0 else 0.00))
