• Example 1:

  Input: I + II

  Output: 3.

  Explanation: I + II = 1 + 2 = 3

• Example 2:

  Input: XXXVIII + IV + XXV

  Output: 67.

  Explanation: XXXVIII + IV + XXV = 38 + 4 + 25 = 67

• Example 3:

  Input: MCLXVI + DCCCXXVI + MMMCXCIX

  Output: 5191.

  Explanation: MCLXVI + DCCCXXVI + MMMCXCIX = 1166 + 826 + 3199 = 5191

Constraints

• The number of roman numerals contained in INPUT is greater than 0 and less than 100.
• Roman numerals in INPUT are separated by a "+" sign.
• Roman numerals are always positive.
• 0 (zero) does not exists in roman numerals.