#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

#define rep(i,n) for(int i=0;i<(n);i++)

int main(){

  string s; cin>> s;
  int n=s.size();

  int res=0;
  for(int i=n-1; i>=0; i--){
    if(s[i]=='+' or s[i]=='-') continue;
    int sub=0, sgn;
    if(s[i]==')'){
      while(s[--i]!='('){
        if(s[i]=='+' or s[i]=='-') continue;
        int _sgn=(i-1>=0 and s[i-1]=='-') ? -1 : 1;
        sub+=(s[i]-'0')*_sgn;
      }
      sgn=(i-1>=0 and s[i-1]=='-') ? -1 : 1;
    }else if('0'<=s[i] and s[i]<='9'){
      sub=s[i]-'0';
      sgn=(i-1>=0 and s[i-1]=='-') ? -1 : 1;
    }
    res+=sub*sgn;
  }

  cout<< res<< endl;
  return 0;
}