y=int(input())
s=''
x=y//1000
if (x>0 and x<4):
    s=s+x*'M'
x=(y//100)%10
if (x>0 and x<4):
    s=s+x*'C'
elif x==4:
    s=s+'CD'
elif x>4 and x<9:
    s=s+'D'+(x-5)*'C'
elif x==9:
    s=s+'CM'
x=(y//10)%10
if (x>0 and x<4):
    s=s+x*'X'
elif x==4:
    s=s+'XL'
elif x>4 and x<9:
    s=s+'L'+(x-5)*'X'
elif x==9:
    s=s+'XC'
x=y%10
if (x>0 and x<4):
    s=s+x*'I'
elif x==4:
    s=s+'IV'
elif x>4 and x<9:
    s=s+'V'+(x-5)*'I'
elif x==9:
    s=s+'IX'
print(s)