#include <bits/stdc++.h>

using namespace std;

int multiply(vector<char> vec){
    int calc = 1;
    int i;
    int start = 0;
    for (i = 0; i < vec.size(); i++){
        if (vec[i] == '*'){
            vector<char> substr;
            for (int j = start; j < i; j++){
                substr.push_back(vec[j]);
            }
            calc *= atoi(&substr[0]);
            start = i + 1;
        }
    }
    vector<char> substr;
    for (int j = start; j < i; j++){
        substr.push_back(vec[j]);
    }
    calc *= atoi(&substr[0]);
    return calc;
}

int fun(vector<char> vec){
    vector<int> arr;
    int start = 0;
    int i;
    int sum = 0;
    for (i = 0; i < vec.size(); i++){
        if (vec[i] == '+'){
            vector<char> substr;
            for (int j = start; j < i; j++){
                substr.push_back(vec[j]);
            }
            //cout <<"fasdf" << multiply(substr);
            arr.push_back(multiply(substr));
            start = i + 1;
        }
    }
   vector<char> substr;
    for (int j = start; j < i; j++){
        substr.push_back(vec[j]);
    }
    arr.push_back(multiply(substr));
    for (int j = 0; j < arr.size(); j++){
        sum += arr[j];
    }
    return sum;
}

int main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int number;

    vector<char> res;
    for(int i = 1; i < s.length(); i++) {
        if(s[i-1] == '(' && s[i] == ')') {
            res.push_back('1');
        } else if(s[i-1] == ')' && s[i] == ')') {
            res.push_back('+');
            res.push_back('1');
            res.push_back(')');
        } else if(s[i-1] == ')' && s[i] == '(') {
            res.push_back('*');
        } else {
            res.push_back('(');
        }
    }
/*
    for (int i = 0; i < res.size(); i++){
        cout << res[i];
    }
    cout << endl;
*/
    int start_index = 0;
    int end_index = 0;
    int calc = 0;

    vector<char> array = res;
    int flag1 = 0;
    int flag = 0;
    while(!flag){
        int i = 0;
        while(1){
            if (array[i] == '('){
                start_index = i;
            } else if (array[i] == ')'){
                end_index = i;
                if (end_index == array.size()-1)
                    flag = 1;
                break;
            }
            i++;
            if (i >= array.size()){
                flag1 = 1;
                break;
            }
        }
        if (flag1)
            break;
        vector<char> substr;
        for (int j = start_index + 1; j < end_index; j++){
            substr.push_back(array[j]);
            //cout << array[j];
        }


        calc = fun(substr);
        string str = to_string(calc);
        res = array;
        vector<char> arr2;
        for (int j = 0; j < start_index; j++){
            arr2.push_back(res[j]);
        }
        for (int j = 0; j < str.size(); j++){
            arr2.push_back(str[j]);
        }
        for (int j = end_index + 1; j < res.size(); j++) {
            arr2.push_back(res[j]);
        }

        /*for (int i = 0; i < arr2.size(); i++){
            cout << arr2[i];
        }*/
        array = arr2;
        if (flag)
            break;
        start_index = 0;
        end_index = 0;
    }
    int nn = fun(array);

    cout<< nn << endl;
    return 0;
}