class Solution(object):
def romanToInt(self, s):
sum=0
convert={'M': 1000,'D': 500 ,'C': 100,'L': 50,'X': 10,'V': 5,'I': 1}
for i in range(len(s)-1):
if convert[s[i]] < convert[s[i+1]]:
sum -= convert[s[i]]
else:
sum += convert[s[i]]
sum += convert[s[-1]]
return sum
if __name__ == '__main__':
a = Solution()
n=list(input())
palindrome_bool = a.romanToInt(n)
print(palindrome_bool)