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

void PrintNum(int n) {
  while (n > 0) {
    if (n >= 100) {
      n = n - 100;  putchar('C');
    } else if (n >= 90) {
      n = n + 10;  putchar('X');
    } else if (n >= 50) {
      n = n - 50;  putchar('L');
    } else if (n >= 40) {
      n = n + 10;  putchar('X');
    } else if (n >= 10) {
      n = n - 10;  putchar('X');
    } else if (n >= 9) {
      n = n + 1;  putchar('I');
    } else if (n >= 5) {
      n = n - 5;  putchar('V');
    } else if (n >= 4) {
      n = n + 1;  putchar('I');
    } else {
      n = n - 1;  putchar('I');
    }
  }
}

int main() {
  int n,r;
  while ( !feof(stdin) ) {
    printf("Enter a number less than 400: ");
    if ( (r = scanf("%d",&n)) == 0 || n < 0 || n >= 400 ) {
      printf("Bad input! Try again.\n");
      if ( r == 0 ) { scanf("%*s"); }
    } else {
      PrintNum(n);
      printf("\n");
    }
  }
  return EXIT_SUCCESS;
}