#!/usr/bin/env python

a = []
s = []
count = 0
n = int(raw_input("Enter the decimal number:"))
while n > 0:
    x = n%10
    a.append(x)
    count = count + 1
    n = n/10
    
if count>0:
    cha2 = 'I'
    
    if a[0] == 4:
        char1 = 'IV'
    elif a[0]>=5 and a[0]<=8:
        cha1 = 'V'
        char1 = cha1 + cha2*(a[0]-5)
    elif a[0] == 9:
        char1 = 'IX'
    else:
        char1 = cha2*a[0]
    s.append(char1)

if count>1:
    cha2 = 'X'
    
    if a[1] == 4:
        char1 = 'XL'
    elif a[1]>=5 and a[1]<=8:
        cha1 = 'L'
        char1 = cha1 + cha2*(a[1]-5)
    elif a[1] == 9:
        char1 = 'XC' 
    else:
        char1 = cha2*a[1]
        s.append(char1)

if count>2:
    cha2 = 'C'
    
    if a[2] == 4:
        char1 = 'CD'
    elif a[2]>=5 and a[2]<=8:
        cha1 = 'D'
        char1 = cha1 + cha2*(a[2]-5)
    elif a[2] == 9:
        char1 = 'CM'
    else:
        char1 = cha2*a[2]
    s.append(char1)

if count>3:
    cha2 = 'M'
    
    char1 = cha2*a[3]
    s.append(char1)


s.reverse()
s = "".join(s)
print s