题解 | #网购#
网购
http://www.nowcoder.com/practice/5d7dfd405e5f4e4fbfdff6862c46b751
v,m,d,t = map(float, input().split())
if m == 11 and d == 11:
v *= 0.7
if t == 1:
v -= 50
elif m == 12 and d == 12:
v *= 0.8
if t == 1:
v -= 50
if v < 0:
print("0.00")
else:
print("%.2f" % v)
