n, first, second  = float(input()),input(), input()

if first == "mm":
    number_mm = n
elif first == "cm":
    number_mm = n * 10
else:
    number_mm = n * 1000

if second == "mm":
    output = number_mm
elif second == "cm":
    output = number_mm / 10
else:
    output = number_mm / 1000

print(f"{output:.3f}")


#'12', 'mm',  'm'

