#include <iostream>
#include <string>
#include <stack>
#include <algorithm>

using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    string s;
    cin >> s;
    stack<char> sta;
    int res=0;
    for(int i=0; i<s.length(); i++) {
        //파이프 시작
        if(s[i]=='(') sta.push(s[i]);
        else {
            sta.pop();
            //레이저
            if(s[i-1]=='(') res+=sta.size();
            //파이프 끝
            else res+=1;
        }
    }
    cout << res;
}

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