#!/usr/bin/python3
#
# This program that takes a number N (a positive integer) in decimal
# notation from the console, and prints its value as a roman numeral.
#
ten_zero = ['', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX']
ten_one = ['', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC']
ten_two = ['', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM']

n = int(input('input a number: '))

r = ''
while n >= 1000:
    r = r + 'M'
    n = n - 1000

c = n // 100
r = r + ten_two[c]
n = n - c*100

d = n // 10
r = r + ten_one[d]
n = n - d*10

r = r + ten_zero[n]

print(r)