вя 4.6

#include <iostream>
#include <iostream>
#include <string>
#include <map>

using namespace std;

int FromRoman(string n)
{
	map<char, int> m;
	m['I'] = 1;
	m['V'] = 5;
	m['X'] = 10;
	m['L'] = 50;
	m['C'] = 100;
	m['D'] = 500;
	m['M'] = 1000;

	int tmp = 0;
	int res = 0;
	for (char c : n)
	{
		int n = m[c];
		if (n < tmp)
		{
			res = res + tmp;
			tmp = n;
		}
		else if (n > tmp)
		{
			if (tmp == 0)
				tmp = n;
			else
			{
				res = res + (n - tmp);
				tmp = 0;
			}
		}
		else if (n == tmp)
		{
			res = res + (tmp + n);
			tmp = 0;
		}
	}
	return res + tmp;
}

int main()
{
	string n;
	cin >> n;
	cout << FromRoman(n);
}