#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>

//初始化从1000到1的数值与符号的列表对
const int value[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
const char* symbol[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};

int main(){
    int num;
    scanf("%d",&num);

    //初始化答案字符串
    char* ans = malloc(sizeof(char) * 16);
    ans[0] = '\0';

    //循环遍历数值列表对，将num转换为罗马数字
    for (int i = 0; i < 13; i++) {
        while (num >= value[i]) {
            num -= value[i];
            //将当前符号添加到答案字符串中,使用strcpy函数将symbol[i]复制到ans的末尾
            strcpy(ans + strlen(ans), symbol[i]);
        }
        if (num == 0) {
            break;
        }
    }
    printf("%s",ans);
    return 0;
}