#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

class Parser {
  private:
  string s;
  string::const_iterator itr;

  public:
  Parser(const string& t) {
    s = t;
    itr = s.begin();
  }

  int exec() {
    int ans = 0;
    {
      bool pls = true;
      while (itr != s.end()) {
        if (*itr == ')') {
          ++itr;
          return ans;
        }
        if (*itr == '(') {
          ++itr;
          ans += exec() * (pls ? 1 : -1);
          continue;
        }
        if (*itr == '+') {
          ++itr;
          pls = true;
        }
        if (*itr == '-') {
          ++itr;
          pls = false;
        }
        if (isdigit(*itr)) {
          ans += (*itr - '0') * (pls ? 1 : -1);
          ++itr;
        }
      }
    }
    return ans;
  }
};

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  string s;
  cin >> s;
  Parser parser(s);
  cout << parser.exec() << '\n';
  return 0;
}