#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    string s;
    cin >> s;
    int n = s.size();
    int x = 0;
    int y = 0;
    int flag[3] = {};
    int mode = 0;
    rep(i,n){
        if(mode == 0){
            if(s[i] == '+'){
                ;
            }else if(s[i] == '-'){
                flag[0] = 1;
            }else{
                x += s[i] - '0';
            }
            mode = 1;
        }else if(mode == 1){
            if(s[i] == '+'){
                mode = 2;
            }else if(s[i] == '-'){
                flag[1] = 1;
                mode = 2;
            }else{
                x *= 10;
                x += s[i] - '0';
            }
        }else{
            if(s[i] == '+'){
                ;
            }else if(s[i] == '-'){
                flag[2] = 1;
            }else{
                y *= 10;
                y += s[i] - '0';
            }
        }
    }

    if(flag[0] == 1)x *= -1;
    if(flag[2] == 1)y *= -1;
    int ans = x - y;
    if(flag[1] == 1)ans = x + y;

    cout << ans << endl;
    return 0;
}