nums = [1000, 900,  500, 400, 100,  90, 50,  40, 10, 9, 5, 4, 1]
roman = ['M', 'CM', 'D', 'CD','C', 'XC','L','XL','X','IX','V','IV','I']

def from_roman_numeral(roman_numeral):
    result = 0
    if roman_numeral in roman:
        result += nums[roman.index(roman_numeral)]
    else:
        arr = list(roman_numeral)
        for i in range(0, len(arr) - 1):
            if arr[i] in roman:
                if arr[i] >= arr[i + 1]:
                    result += nums[roman.index(arr[i])]
                elif arr[i] <= arr[i + 1]:
                    result -= nums[roman.index(arr[i])]
    print(result)
    return result

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