//No.193 筒の数式

import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No0193 {
    
    static final Scanner in = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve() {
        String s = in.next();
        int len = s.length();
        s = s + s;
        int res = -1;
        for (int i=len; i<2*len; i++) {
            if (s.charAt(i-1) != '-' && s.charAt(i-1) != '+' && s.charAt(i-len) != '-' && s.charAt(i-len) != '+')
                res = max(res,calc(s,i-len,i));
        }
        out.println(res);
    }

    static int calc(String s,int x, int y) {
        int res = 0, t = 0, f = 0;
        for (int i=x; i<y; i++) {
            if (s.charAt(i) == '+') {
                if (f == 0) res += t;
                else res -= t;
                f = 0;
                t = 0;
            }else if (s.charAt(i) == '-') {
                if (f == 0) res += t;
                else res -= t;
                f = 1;
                t = 0;
            }else {
                t *= 10;
                t += s.charAt(i) - '0';
            }
        }
        return f == 0 ? res + t : res - t;
    }

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}
}