#include <iostream>
#include <string>
using namespace std;
int main () {
  int decimal;
  cout << "Enter an integer value from 1 to 999: ";
  cin >> decimal;
  if (decimal<1||decimal>999) {
    cout << "       Invalid Input.    Program terminated." << endl;
    return 1453;
  } else {
      cout << "Roman numeral equivalent: ";
  while (decimal!=0) {
    if (decimal>900 && decimal<1000) {
      cout << "CM"; decimal-=900; }
    if (decimal>500 && decimal<900) {
      cout << "D"; decimal-=500; }
    if (decimal>400 && decimal<500) {
      cout << "CD"; decimal-=400; }
    if (decimal>100 && decimal<400) {
      cout << "C"; decimal-=100; }
    if (decimal>90 && decimal<100) {
      cout << "XC"; decimal-=90; }
    if (decimal>50 && decimal<90) {
      cout << "L"; decimal-=50; }
    if (decimal>40 && decimal<50) {
      cout << "XL"; decimal-=40; }
    if (decimal>10 && decimal<40) {
      cout << "X"; decimal-=10; }
    if (decimal==9) {
      cout << "IX"; decimal-=9; }
    if (decimal>5 && decimal<9) {
    cout << "V"; decimal-=5; }
    if (decimal==4) {
    cout << "IV"; decimal-=4; }
    if (decimal>=1 && decimal<4) {
    cout << "I"; decimal-= 1; }
  }}
  cout << endl;
  return 0;
}