#include<iostream>
#include<string>

// your function(s) here

int main() {
    std::string s;
    std::cin >> s;
    current_number cur_num;
    int sign = 1;
    if (s[0] == '-') {
        sign = -1;
    }
    cur_num = shift(s, 0);
    long long ans = cur_num.number;
    while (cur_num.pos < s.size()) {
        sign = s[cur_num.pos];
        cur_num.pos++;
        cur_num = shift(s, cur_num.pos);
        if (sign == '+') {
            ans += cur_num.number;
        } else {
            ans -= cur_num.number;
        }
    }
    std::cout << ans << "\n";
}