def int_to_roman(input):

    if type(input) != int:

        raise TypeError("expected integer, got %s" % type(input))

    if not 0 < input < 4000:

        raise ValueError("Argument must be between 1 and 3999")

    ints = (1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1)

    nums = ("M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I")

    result = ""

    for i in range(len(ints)):

        count = int(input / ints[i])

        result += nums[i] * count

        input -= ints[i] * count

    return result