#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    string s;
    cin >> s;

    int res{ 0 }, f{ 1 };
    for (size_t i = 0; i < s.size(); ++i)
    {
        switch (s[i])
        {
        case '(':
            if (i)
                f = s[i - 1] == '-' ? -1: 1;

            res += (s[i + 1] - '0') * f;
            ++i;
            continue;
            break;
        case ')':
            f = 1;
            break;
        case '+':
        case '-':
        {
            int ff = s[i] == '-' ? -1 : 1;
            if (s[i + 1] == '(')
            {
                res += (s[i + 2] - '0') * f * ff;
                f = ff;
                i += 2;
                continue;
            }
            res += (s[i + 1] - '0') * f * ff;
            ++i;
            break;
        }
        default:
            if (i == 0)
                res = s[i] - '0';
        }
    }

    cout << res << "\n";

    return 0;
}