number = int(input())
x = number % 10
y = number // 10
result = ''


if y <= 3:
    result += "X"*y
elif y == 4:
    result += "XL"
elif y <= 8 and y >=5:
    result += "L" + "X"*(y-5)
elif y == 9:
    result = "XC"
elif y == 10:
    result = "C"

if x <= 3:
    print("I"*x)
elif x == 4:
    print("IV")
elif x <= 8 and x >=5:
    print("V" + "I" *(x-5))
elif x == 9:
    print("IX")
elif x == 10:
    print("X")