02. Bike Race

juniors = int(input())
seniors = int(input())
trace = input()

if trace == "trail":
  juniors *= 5.5
  seniors *= 7
elif trace == "cross-country":
  if juniors + seniors >= 50:
    juniors *= 8 * 0.75
    seniors *= 9.50 * 0.75
  else:
    juniors *= 8
    seniors *= 9.50
elif trace == "downhill":
  juniors *= 12.25
  seniors *= 13.75
else:
  juniors *= 20
  seniors *= 21.5

total = (juniors + seniors) * 0.95
total1 = int(total)
total2 = total % 1
if len(str(total2)) >= 5:
    if str(total2)[4] == "5":
        total2 += 0.001
print(f"{total1 + total2:.2f}")