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#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

int main() {
    ifstream fin("input.txt");
    ofstream fout("output.txt");

    string str; fin >> str;
    int n = str.size();
    str = ' ' + str;
    vector<vector<int>> vec(n + 1, vector<int>(n + 1));
    vec[0][0] = 1;
    for (int i = 1; i <= n; i++)
        for (int j = 0; j <= n; j++) {
            if (j - 1 >= 0 && (str[i] == '(' || str[i] == '?'))
                vec[i][j] += vec[i - 1][j - 1];
            if (j + 1 <= n && (str[i] == ')' || str[i] == '?'))
                vec[i][j] += vec[i - 1][j + 1];
        }
    fout << vec[n][0] << endl;


    fin.close();
    fout.close();
    return 0;
}