Given a balanced parentheses string s, compute and return the total score of the string based on the following rules:

• A single pair () has a score of $1$.

• The concatenation of two balanced substrings AB has a score of the score of A plus the score of B.

• A balanced substring enclosed in parentheses (A) has a score of $2$ multiplied by the score of A.

Constraints:

• $2 \leq$ s.length $\leq 50$

• s consists of only '(' and ')'.

• s is a balanced parentheses string.

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