#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    string s; cin >> s;
    bool xisminus = false, yisminus = false, op = true;
    xisminus = (s[0] == '-');
    rep(i,s.size()-1){
        if(s[i] == '-' && s[i+1] == '-'){
            yisminus = true;
            op = false;
        }else if(s[i] == '+' && s[i+1] == '-'){
            yisminus = true;
            op = true;
        }
    }
    rep(i,s.size()-2){
        if(s[i+1] == '-'){
            if(s[i+2] != '+' && s[i+2] != '-'){
                if(s[i] != '+' && s[i] != '-'){
                    op = false;
                }
            }
        }
    }

    string x = "";
    if(xisminus){
        rep(i,s.size()){
            if(i == 0) continue;
            if(s[i] == '+' || s[i] == '-') break;
            x += s[i];
        }
    }else{
        rep(i,s.size()){
            if(s[i] == '+' || s[i] == '-') break;
            x += s[i];
        }
    }

    string y = "";
    for(int i=x.size() + (xisminus); i<s.size();i++){
        if(s[i] == '+' || s[i] == '-') continue;
        y += s[i];
    }

    int X = stoi(x), Y = stoi(y);
    if(xisminus) X = - X;
    if(yisminus) Y = - Y;
    if(op){
        cout << X - Y << endl;
    }else{
        cout << X + Y << endl;
    }
}