n=int(input())
a=n//1000
a%=1000
print('I'*a,end='')
b=n//500
n%=500
print('D'*b, end='')
c = n//100
n%=100
print('C'*c, end='')
l = n//50
n%=50
print('L'*l, end='')
x = n//10
n%=10
print('X'*x, end='')
v = n//5
n%=5
print('V'*v, end='')
print('I'*n, end='')