n = input()
s_flg = 0
s = ""
for i in n[::-1]:
    if s_flg == 0 and i == "u":
        s += "1"
        s_flg = 1
    elif s_flg == 0 and i == "m":
        s += "0"
        s_flg = 1
    elif s_flg == 1 and i == "h":
        s_flg = 0
print(int(s[::-1], 2))