#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

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

	string s;
	cin >> s;

    string pattern = "([+-]*)(\\d+)([+-]+)(\\d+)";
    regex re(pattern);
    smatch match;
    regex_match(s, match, re);
    
    int res1=stoi(match.str(2)),res2=stoi(match.str(4));
    if (match.str(1) == "-")
        res1 *= -1;
    if (match.str(3) == "+" || match.str(3) == "--" || match.str(3) == "++")
        res2 *= -1;

    cout << res1 + res2 << "\n";

	return 0;
}