#include <bits/stdc++.h>

using namespace std;

int main()
{
    string e; cin >> e;

    int pos_op;
    for (int i = 1; i < e.size(); ++i) {
        if (isdigit(e[i - 1]) && !isdigit(e[i])) {
            pos_op = i;
            break;
        }
    }

    char op = e[pos_op];
    string x = e.substr(0, pos_op);
    string y = e.substr(pos_op + 1, e.size() - pos_op - 1);

    cout << stoi(x) + (op == '+' ? -1 : 1) * stoi(y) << endl;
}