#include <bits/stdc++.h>

using namespace std;

// ifstream in("test.in");
// ofstream out("test.out");

struct Consumer {
    int consumed;
    string name;

    bool operator<(const Consumer& other) {
        // First compare x, then y
        return consumed < other.consumed;
    }
};

int convert(string roman) {
    unordered_map<char, int> numMapping;
    numMapping['I'] = 1;
    numMapping['V'] = 5;
    numMapping['X'] = 10;
    numMapping['L'] = 50;
    numMapping['C'] = 100;
    numMapping['D'] = 500;
    numMapping['M'] = 1000;
    
    
    if (!roman.size()) {
        return 0;
    }

    int total = 0;
    int checkpoint = numMapping[roman[0]];
    int stretchTotal = 0;

    for (int j = 0; j < roman.size(); j++) {
        int charDex = numMapping[roman[j]];
        if (charDex == checkpoint) {
            stretchTotal += charDex;
        } else if (charDex > checkpoint) {
            total += charDex - stretchTotal;
            checkpoint = charDex;
            stretchTotal = 0;
        } else {
            total += stretchTotal;
            checkpoint = charDex;
            stretchTotal = charDex;
        }
    }
    total += stretchTotal;
    return total;
}


int main(int argc, char *argv[]) {
    string inName = "test.in";
    string outName = "test.out";
    
    if (argc > 1) {
        inName = argv[1];
        cout << "Using \"" << inName << "\" for test name" << endl;
    } else {
        cout << "Warning: no in name provided, defaulting to test.in" << endl;
    }

    if (argc > 2) {
        outName = argv[2];
        cout << "Using \"" << outName << "\" for out name" << endl;
    } else {
        cout << "Warning: no out name proviced, defaulting to test.out" << endl;
    }

    ifstream in(inName);
    ofstream out(outName);

    string expression = "";
    string roman = "";
    int total = 0;
    char nextOperation = '0';  // also serves as first number flag
    #define isFirstNumber nextOperation == '0'
    #define isSubtract nextOperation == '-'
    #define isSum nextOperation == '+'

    char ch;
    while (in.get(ch)) {
        if (ch == '+' || ch == '-') {
            if (isFirstNumber || isSum) {
                total += convert(roman);
            } else {
                total -= convert(roman);
            }
            nextOperation = ch;
            roman = "";

            continue;
        }

        roman += ch;
    }
    if (isFirstNumber || isSum) {
        total += convert(roman);
    } else {
        total -= convert(roman);
    }
    out << total << endl;

    return 0;
}