Time Limit: 3 seconds
Memory Limit: 512 megabytes
Alex was programming while Valentina (his toddler daughter) got there and started asking many questions about the round brackets (or parenthesis) in the code. He explained her a bit and when she got it he gave her a task in order to finish his code on time.
For the purpose of this problem we consider only strings consisting of opening and closing round brackets, that is characters '(' and ')'.
The sequence of brackets is called correct if:
For example, the sequences "()()" and "((()))(())" are correct, while ")(()", "(((((" and "())" are not.
Alex took a piece of paper, wrote a string s consisting of brackets and asked Valentina to count the number of distinct non-empty substrings of s that are correct sequences of brackets. In other words, her task is to count the number of non-empty correct sequences of brackets that occur in a string s as a substring (don't mix up with subsequences).
When Valentina finished the task, Alex noticed he doesn't know the answer. Help him don't loose face in front of Valentina and solve the problem!
The first line of the input contains an integer n (1 ≤ n ≤ 500 000) — the length of the string s.
The second line contains a string s of length n consisting of only '(' and ')'.
In the first sample, there are 5 distinct substrings we should count: "()", "()()", "()()()", "()()()()" and "()()()()()".
In the second sample, there are 3 distinct substrings we should count: "()", "(())" and "(())()".