1

#include <bits/stdc++.h>
using namespace std;

int main() {
	//freopen("number.in","r",stdin);
	//freopen("mumber.out","w",stdout);
	string ans = "";
	int n;
	cin >> n;
	int a[13] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
	string b[13] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
	for (int i = 0; i < 13; i++) {
		while (n >= a[i]) {
			ans += b[i];
			n -= a[i];
		}
	}
	cout << ans;
	return 0;
}