#include <iostream>
#include <set>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
#include <regex>

using namespace std;

#define rep(i, n) for(int i = 0; i < n; i++)
#define repi(i, n) for(auto i = (n).begin(); i != (n).end(); i++)
#define in_arr(type, a, n) copy_n(istream_iterator<type>(cin), n, (a).begin());
#define ll long long int

string s;
string::iterator i;

ll num();
ll eval();

int main(){
    cin >> s;
    i = s.begin();
    cout << eval() << endl;
    return 0;
}

ll eval(){
    ll ans = num();
    if(i == s.end()){
        return ans;
    }
    while(i != s.end() && (*i == '+' || *i == '-')){
        if(*i == '+'){
            ++i;
            ans += num();
        }else if(*i == '-'){
            ++i;
            ans -= num();
        }
    }
    return ans;
}

ll num(){
    if('0' <= *i && *i <= '9')
        return (ll)(*(i++) - '0');
    if(*i == '('){
        ++i;
        ll ans = eval();
        ++i;
        return ans;
    }
    return 0;
}