# -*- coding: utf-8 -*

#перевод арабских чисел в римские от 1 до 9

#10 X 17 XVII
#20 XX 27 XXVII
#40 XL  36
#50 L
#60 LX
#90 XC

number = int(input())

if 1 <= number // 10 <= 3:
    print('X' * (number // 10), end = '')
elif number // 10 == 4:
    print('XL', end = '')
elif 5 <= number // 10 <= 8:
    print('L' + 'x'*(number//10 - 5), end = '')
elif number // 10 == 9:
    print('XC', end = '')

number = number % 10

if number <= 3:
    print('I' * number)
elif number == 4:
    print('IV')
elif 5 <= number <= 8:
    print('V' + 'I' * (number - 5))
elif number == 9:
    print('IX')