res = 0
c = False

CONV_TABLE = ((1000, 'M'), (900, 'CM'), (500, 'D'), (400, 'CD'),
    (100, 'C'), (90, 'XC'), (50, 'L'), (40, 'XL'),
    (10, 'X'), (9, 'IX'), (5, 'V'), (4, 'IV'), (1, 'I'))


def roman_to_arab(txt):
    txt = txt.upper()
    ret = 0
    for arab, roman in CONV_TABLE:
        while txt.startswith( roman ):
            ret += arab
            txt = txt[ len( roman ): ]
    return ret

x = [i for i in input()]
for i in range(len(x)):
    if c:
        c = False
        continue
    elif i == len(x):
        res += roman_to_arab(x[i])


    if x[i] == 'I':
        if x[i + 1] == 'V':
            c = True
            res += 4
        elif x[i + 1] == 'X':
            c = True
            res += 9

    elif x[i] == 'X':
        if x[i + 1] == 'L':
            res += 40
            c = True
        elif x[i + 1] == 'C':
            res += 90
            c = True
    elif x[i] == 'C':
        if x[i + 1] == 'D':
            res += 400
            c = True
        elif x[i + 1] == 'M':
            res += 900
            c = True
    else:
        res += roman_to_arab(x[i])
print(res)