#include <cstdlib>
#include <iostream>
#include <sstream>
#include <stack>
#include <string>


static inline int
eval(std::istringstream& ss) noexcept
{
  int x = 0;
  char op = '\0';
  for (auto ch = ss.get(); ch != EOF; ch = ss.get()) {
    switch (ch) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        if (op == '\0') {
          x = ch - '0';
        } else {
          auto y = ch - '0';
          if (op == '+') {
            x += y;
          } else {
            x -= y;
          }
        }
        break;
      case '+':
      case '-':
        op = static_cast<char>(ch);
        break;
      case '(':
        if (op == '\0') {
          x = eval(ss);
        } else {
          if (op == '+') {
            x += eval(ss);
          } else {
            x -= eval(ss);
          }
        }
        break;
      case ')':
        return x;
    }
  }
  return x;
}


int
main()
{
  std::cin.tie(nullptr);
  std::ios::sync_with_stdio(false);

  std::string s;
  std::cin >> s;

  std::istringstream ss(s);
  std::cout << eval(ss) << std::endl;

  return EXIT_SUCCESS;
}