// No.222 引き算と足し算
// https://yukicoder.me/problems/no/222
//
#include <iostream>
#include <vector>
#include <string>
#include <regex>
using namespace std;

int solve(string s);
vector<string> split(string&& s, regex&& pattern);


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

    string s;
    cin >> s;
    int ans = solve(s);
    cout << ans << endl;
}

int solve(string s) {
    string t(s, 1);
    regex rx(R"(\D)");
    smatch result;

    char op;
    if (regex_search(t, result, rx)) {
        if (result[0] == '+')
            op = '-';
        else
            op = '+';
        s[result.position()+1] = ' ';

        vector<string> numbers = split(move(s), regex(" "));
        int a = stoi(numbers[0]);
        int b = stoi(numbers[1]);

        if (op == '-')
            return a - b;
        else
            return a + b;
        }
    return 0;
}


vector<string> split(string&& s, regex&& pattern)
{
    sregex_token_iterator first(s.begin(), s.end(), pattern, -1);
    sregex_token_iterator last;
    return vector<string>(first, last);
}