#include <iostream>
using namespace std;



int main(){
    int M = 1000, D=500, C=100,L=50, X=10, V=5, I=1;
    int x;
    while (cin >> x){
        while (x>=M){
            cout << "M";
            x-=M;
        }
        while (x>=900){
            cout << "CM";
            x -= 900;
        }
        while (x>=D){
            cout << "D";
            x-=D;
        }
        while (x>=400){
            cout << "CD";
            x-=400;
        }
        while(x>=C){
            cout << "C";
            x-=C;
        }
        while(x>=90){
            cout << "XC";
            x-=90;
        }
        while (x>=L){
            cout << "L";
            x-=L;
        }
        while (x>=40){
            cout << "XL";
            x-=40;
        }
        while (x>=X){
            cout << "X";
            x-=X;
        }
        while (x>=9){
            cout << "IX";
            x-=9;
        }
        while (x>=V){
            cout << "V";
            x-=V;
        }
        while (x>=4){
            cout << "IV";
            x-=4;
        }
        while (x>=I){
            cout << "I";
            x-=I;
        }
        cout << endl;
    }
    return 0;
}