# 4.33 羅馬數字

// for 小於4000的數字
#include <stdio.h>
char *toRoman(int n);
int main(){
	int n;
	scanf("%d", &n);
	printf("%s", toRoman(n));
} 
char *toRoman(int n){
	int y[4];
	for (int i=0; i<4; ++i){
		y[3-i] = n%10;
		n /= 10;
	}
	//char *x[]={"I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX", "X"};
	char r[] = "MDCLXVI";
	static char roman[17];
	int k=0;
	for (int i=0; i<4; ++i){
		if (y[i]<=3)
			for (int j=0; j<y[i]; j++)
				roman[k++] = r[i*2];
		else if (y[i]==4){
			roman[k++] = r[i*2];
			roman[k++] = r[i*2-1];
		}
		else if (y[i]<=8){
			roman[k++] = r[i*2-1];
			for (int j=5; j<y[i]; j++)
				roman[k++] = r[i*2];
		}
		else if (y[i]==9){
			roman[k++] = r[i*2];
			roman[k++] = r[i*2-2];
		}
	}
	return roman;
}
//http://squall.cs.ntou.edu.tw/cprog/practices/a013_arabic2Roman_4up.pdf



//https://zhuanlan.zhihu.com/p/104273756
void toRoman(int n) {
	int values[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
	const char* romans[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
	for (int i = 0; i < 13; i++) {
		while (n >= values[i]) {
			n -= values[i];
			printf("%s", romans[i]);
		}
	}
}