#include <bits/stdc++.h>
//#include <atcoder/all>
//using namespace atcoder;
const double pi = 3.141592653589793238462643383279;
using namespace std;
//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<long long, long long> PLL;
typedef pair<int, PII> TIII;
typedef long long LL;
typedef unsigned long long ULL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;

//container util
//------------------------------------------
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define SQ(a) ((a) * (a))
#define EACH(i, c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define EXIST(s, e) ((s).find(e) != (s).end())
#define SORT(c) sort((c).begin(), (c).end())

//repetition
//------------------------------------------
#define FOR(i, s, n) for (int i = s; i < (int)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define MOD 1000000007

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto &a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
const double EPS = 1e-8, PI = acos(-1);
//ここから編集    
typedef string::const_iterator State;
int expr(State& begin);
int expr2(State& begin);
int expr2(State &begin){
    if(*begin == '('){
        begin++;
        int res = expr(begin);
        begin++;
        return res;
    }else{
        int res = *begin-'0';
        begin++;
        return res;
    }
}
int expr(State& begin){
    int res = expr2(begin);
    while(1){
        if(*begin == '+'){
            begin++;
            res += expr2(begin);
        }else if(*begin == '-'){
            begin++;
            res -= expr2(begin);
        }else break;
    }
    return res;
}
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(6);

    string s; cin >> s;
    State begin = s.begin();
    cout << expr(begin) << endl;
    return 0;
}