#include <iostream>

using namespace std;

int ans;
string s;

void Solve() {
    int start;
    char op1 = ' ';
    bool flag = false;
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == '(') {
            start = i;
            flag = true;
        } else if (s[i] == ')') {
            char op2 = ' ';
            int cnt = 0;
            for (int j = start + 1; j < i; ++j) {
                if (isdigit(s[j])) {
                    if (op2 == ' ') cnt += s[j] - '0';
                    else if (op2 == '+') cnt += s[j] - '0';
                    else cnt -= s[j] - '0';
                } else {
                    op2 = s[j];
                }
            }
            if (op1 == ' ') ans += cnt;
            else if (op1 == '+') ans += cnt;
            else ans -= cnt;
            flag = false;
        } else if (!flag && isdigit(s[i])) {
            if (op1 == ' ') ans += s[i] - '0';
            else if (op1 == '+') ans += s[i] - '0';
            else ans -= s[i] - '0';
        } else if (!flag) {
            op1 = s[i];
        }
    }

    printf("%d\n", ans);
}

int main() {
    // freopen("pm.in", "r", stdin);
    // freopen("pm.out", "w", stdout);

    cin >> s;

    Solve();

    return 0;
}