#include <bits/stdc++.h>

//#define int long long

using namespace std;

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    string s;
    cin >> s;

    int sol = 1;
    int o = 1;
    int c = 0;
    for(int i = 1; i < s.size(); i++){
        if(s[i-1] == ')' && s[i] == '('){
            sol *= min(c, o);
            c = 0;
            o = 0;
        } else if(s[i] == ')'){
            c++;
        } else if(s[i] == '('){
            o++;
        }
    }
    sol += c;
    cout << sol << "\n";
}