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n = input().split()
keshu = int(n[0])
basic = 8
if n[1] == "y":
    basic += 5
elif n[1] == "n":
    basic = basic
if keshu <= 1000:
    price = basic
else:
    add = (keshu - 1000) // 500
    yushu = (keshu - 1000) % 500
    if yushu != 0:
        add += 1
    price = basic + add * 4
print(price)