def checkio(data):
    ROMA = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I']
    DEC = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
    i = 0
    x = ''
    while i < len(DEC):
        if data < DEC[i]:
            i += 1
        else:
            data -= DEC[i]
            x += ROMA[i]
    return str(x)

print(checkio(3410))