/*
#include<kyopro/master>
void self::main(){
  STR(s);
  ll N=s.size();
  
  vec<ll>pos(N,-1);
  vec<ll>st;
  fo(i,N){
    if(s[i]=='('){
      st.eb(i);
    }else if(s[i]==')'){
      ll j=st.pop_back();
      pos[i]=j;
      pos[j]=i;
    }
  }
  
  auto dfs=[&](this auto self,ll l,ll r)->ll{
    if(l>r)return 0;
    if(l==r)return s[l]-'0';
    if(s[l]=='('&&s[r]==')')return self(l+1,r-1);
    
    ll res=0;
    if(in('0',s[l],'9'+1)){
      ll x=s[l]-'0';
      res=x+self(l+1,r);
    }
    else if(s[l]=='('){
      ll x=self(l,pos[l]);
      res=x+self(pos[l]+1,r);
    }
    else{
      if(in('0',s[l+1],'9'+1)){
       ll x=s[l+1]-'0';
       if(s[l]=='-')x=-x;
        res=x+self(l+2,r);
      }
      else if(s[l+1]=='('){
        ll x=self(l+1,pos[l+1]);
        if(s[l]=='-')x=-x;
        res=x+self(pos[l+1]+2,r);
      }
      
    }
    
    return res;
  };
  pp(dfs(0,N-1));
}
*/

#include<bits/stdc++.h>
using namespace std;
namespace self{void main();void sub();template<ostream&o>void pp(const auto&...a);void epp(const auto&...a);}
int main(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);self::main();}
#define eb emplace_back
#define RD(T,...) T __VA_ARGS__;lin(__VA_ARGS__)
#define STR(...) RD(str,__VA_ARGS__)
#define fo(i,...) for(auto[i,i##stop,i##step]=for_range<ll>(0,__VA_ARGS__);i<i##stop;i+=i##step)
namespace self{
using ll=long long;
template<class T>constexpr auto for_range(T s,T b){T a=0;if(s)swap(a,b);return array{a-s,b,1-s*2};}
void lin(auto&...a){(cin>>...>>a);}
bool in(auto l,auto m,auto r){return l<=m&&m<r;}
template<class...A>using pack_back_t=tuple_element_t<sizeof...(A)-1,tuple<A...>>;
}
namespace self{
template<class V>struct vec;
template<int D,class T>struct hvec_helper{using type=vec<typename hvec_helper<D-1,T>::type>;};
template<class T>struct hvec_helper<0,T>{using type=T;};
template<int D,class T>using hvec=hvec_helper<D,T>::type;
template<class V>struct vec:vector<V>{
  using vector<V>::vector;
  auto&emplace_back(auto&&...a){vector<V>::emplace_back(std::forward<decltype(a)>(a)...);return*this;}
  auto pop_back(){auto r=this->back();vector<V>::pop_back();return r;}
};
template<class...A>requires(sizeof...(A)>=2)vec(const A&...a)->vec<hvec<sizeof...(A)-2,pack_back_t<A...>>>;
}
namespace self{
struct str:string{
  str()=default;
  ll size()const{return string::size();}
};
}
template<ostream&o=cout>void self::pp(const auto&...a){const char*c="";((o<<c<<a,c=" "),...);o<<'\n';}
void self::main(){
  STR(s);
  ll N=s.size();

  vec<ll>pos(N,-1);
  vec<ll>st;
  fo(i,N){
    if(s[i]=='('){
      st.eb(i);
    }else if(s[i]==')'){
      ll j=st.pop_back();
      pos[i]=j;
      pos[j]=i;
    }
  }

  auto dfs=[&](this auto self,ll l,ll r)->ll{
    if(l>r)return 0;
    if(l==r)return s[l]-'0';
    if(s[l]=='('&&s[r]==')')return self(l+1,r-1);

    ll res=0;
    if(in('0',s[l],'9'+1)){
      ll x=s[l]-'0';
      res=x+self(l+1,r);
    }
    else if(s[l]=='('){
      ll x=self(l,pos[l]);
      res=x+self(pos[l]+1,r);
    }
    else{
      if(in('0',s[l+1],'9'+1)){
       ll x=s[l+1]-'0';
       if(s[l]=='-')x=-x;
        res=x+self(l+2,r);
      }
      else if(s[l+1]=='('){
        ll x=self(l+1,pos[l+1]);
        if(s[l]=='-')x=-x;
        res=x+self(pos[l+1]+2,r);
      }

    }

    return res;
  };
  pp(dfs(0,N-1));
}