// “Immediate-mode” Roman numerals.
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{
  int n = atoi(argv[1]);
  #define seg(val, rep) while (n >= val) n -= val, printf("%s", rep)
  seg(1000, "M"); seg(900, "CM"); seg(500, "D"); seg(400, "CD");
  seg(100, "C"); seg(90, "XC"); seg(50, "L"); seg(40, "XL");
  seg(10, "X"); seg(9, "IX"); seg(5, "V"); seg(4, "IV"); seg(1, "I");
  printf("\n");
  return 0;
}