#include <bits/stdc++.h>
#include <string>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) (a)=max(a, b)
#define chmin(a, b) (a)=min(a, b)
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=1e9+7;


/*
 for(i=0; i<N; i++)
   cin >> a[i];
*/

map<ll, ll> mp;

ll rec(string s) {
  if(s.size()==3) {
    ll a=s[0]-'0';
    ll b=s[2]-'0';
    if(s[1]=='+') return a+b;
    else return a-b;
  }
  
  ll res=0;
  ll r=0;
  for(ll i=0; i<s.size(); i++) {
    if(s[i]=='+') r=0;
    else if(s[i]=='-') r=1;
    else if(s[i]=='(') {
      if(r==0) res+=rec(s.substr(i+1, mp[i]-i-1));
      else res-=rec(s.substr(i+1, mp[i]-i-1));
      i=mp[i];
    }else {
      if(r==0) res+=s[i]-'0';
      else res-=s[i]-'0';
    }
  }
  
  return res;
}

int main() {
  ll i, j, k;
  
  string S;
  cin >> S;
  
  stack<ll> st;
  for(i=0; i<S.size(); i++) {
    if(S[i]=='(') {
      st.push(i);
    }else if(S[i]==')') {
      ll u=st.top(); st.pop();
      mp[u]=i;
    }
  }
  
  
  pt(rec(S));
  
  
}