V = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}

def getValue(S,i):
    c = S[i]
    for j in range(i+1,len(S)):
        if S[j] != S[i]:
            if V[S[i]] > V[S[j]]:
                return V[S[i]]
            else:
                return -V[S[i]]
    return V[S[i]]

def decode(S):
    result = 0
    for i in range(0,len(S)):
        result += getValue(S,i)
    return result

def encode(x):
    available = sorted([1,5,10,50,100,500,1000,4,9,40,90,400,900])
    count = 0
    while(x != 0):
        for y in available[::-1]:
            if y <= x:
                x -= y
                if y == 4: available.remove(9)
                if y == 9: available.remove(4)
                if y == 40: available.remove(90)
                if y == 90: available.remove(40)
                if y == 400: available.remove(900)
                if y == 900: available.remove(400)
                if y in [1,5,10,50,100,500,1000]:
                    count += 1
                else:
                    count += 2
                break
    return count


answer = 0
for line in open("p089_roman.txt"):
    answer += len(line.strip()) -  encode(decode(line.strip()))
print answer