m, x = input().split()
m = eval(m)
if m > 1000:
    if m / 500 == m // 500:
        c = ((m-1000) / 500)*4 + 8
    else:
        c = ((m - 1000) // 500 + 1)*4 + 8
elif 0 < m <= 1000:
    c = 8
if x[0] == "y":
    print("{}".format(c + 5))
elif x[0] == "n":
    print("{}".format(c))