Write a
total = 0
str = roman number string
While str is not empty
If str has length 1, or value(first character of str) is at least value(second character of str)
Add value(first character of str) to total.
Remove first character from str.
Else
difference = value(second character of str) - value(first character of str)
Add difference to total.
Remove first character and second character from str.
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