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n = input()
roman = {"I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000}
total = 0
for i in range(0, len(n), 2):
A, R = int(n[i]), roman[n[i + 1]]
if i < len(n)-2:
nR = roman[n[i + 3]]
else:
nR = 0
if nR > R:
total -= A * R
else:
total += A * R
print(total)
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