#include <bits/stdc++.h>

struct Parser {
    using Iter = std::string::const_iterator&;
    std::string line;

    Parser(std::string s): line(s) {}

    int parse() {
        auto it = line.cbegin();
        return expr(it);
    }

    void skip(Iter it, char c) {
        assert(*it == c);
        ++it;
    }

    int expr(Iter it) {
        auto res = term(it);
        while (it != line.end() && (*it == '+' || *it == '-')) {
            if (*it == '+') {
                skip(it, '+');
                res += term(it);
            } else {
                skip(it, '-');
                res -= term(it);
            }
        }
        return res;
    }

    int term(Iter it) {
        if (*it == '(') {
            skip(it, '(');
            auto res = expr(it);
            skip(it, ')');
            return res;
        }
        return digit(it);
    }

    int digit(Iter it) {
        assert(std::isdigit(*it));
        char c = *it;
        skip(it, c);
        return c - '0';
    }
};

int main() {
    std::string s;
    std::cin >> s;
    Parser parser(s);
    std::cout << parser.parse() << std::endl;
}