#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

struct Exe{
  string s;
  Exe(const string & S) : s(S){
    if(s[0] != '-') s = "+" + s;
  }

  int value(){
    int ans = 0;
    int cnt = 0;
    int si = 0;
    for(int i = 0;i < s.size();i++){
      char c = s[i];
      if(cnt == 0){
        if(c == '+') si = 1;
        else si = -1;
        cnt++;
      }
      else{
        if(c == '('){
          i++;
          int open = 1;
          string N = "";
          while(true){
            if(s[i] == ')'){
              open--;
              if(open == 0) break;
            }
            if(s[i] == '('){
              open++;
            }
            N += s[i];
            i++;
          }
          ans += si * (int)(Exe(N).value() - '0');
        }
        else{
          ans += si * (int)(c - '0');
        }
        cnt--;
      }
    }
    return ans;
  }
};

int main(){
  string s;
  cin >> s;
  cout << Exe(s).value() << endl;
}