```
romans = [["I","V","X","L","C","D","M"],[1,5,10,50,100,500,1000]]
result = 0
s = s.split("")
i = 0
while i<s.length
j = 0
if (s[i] == "I" && s[i+1] == "X") || (s[i] == "I" && s[i+1] == "V")
result -= 2
elsif (s[i] == "X" && s[i+1] == "L") || (s[i] == "X" && s[i+1] == "C")
result -= 20
elsif (s[i] == "C" && s[i+1] == "D") || (s[i] == "C" && s[i+1] == "M")
result -= 200
end
while j<romans[0].length
if s[i] == romans[0][j]
result += romans[1][j]
end
j += 1
end
i +=1
end
return result
end
```