#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

int main() {
    int original = 0;
    char table[][3] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
    int tablen[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
    do {
        cout << "Число от 1 до 3999 ";
        cin >> original;
    } while (original < 1 || original > 3999);
    for (int i = 0; i < 13; i++) {
        while(original/tablen[i]){
            cout << table[i];
            original -= tablen[i];
        }
    }
    cout << endl;
    return 0;
}