Roman numerals is an ancient number system. In Roman numerals, I, V, X, L represent 1, 5, 10, 50 respectively.
However, Rockman numerals is a mysterious number system that is even more ancient...

Input

A string of length $L$ consisting of I, V, X, L only. $(1\leq L\leq 10^5)$

Output

Output one integer, the number the Rockman numeral represents.