import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        String s = sc.next();
        int length = s.length();
        char[] values = (s + s).toCharArray();
        long ans = Long.MIN_VALUE;
        for (int i = 0; i < length; i++) {
            if (values[i] == '+' || values[i] == '-' || values[i + length - 1] == '+' || values[i + length - 1] == '-') {
                continue;
            }
            long sum = 0;
            long tmp = 0;
            boolean isPlus = true;
            for (int j = 0; j < length; j++) {
                if (values[i + j] == '+') {
                    if (isPlus) {
                        sum += tmp;
                    } else {
                        sum -= tmp;
                        isPlus = true;
                    }
                    tmp = 0;
                } else if (values[i + j] == '-') {
                    if (isPlus) {
                        sum += tmp;
                        isPlus = false;
                    } else {
                        sum -= tmp;
                    }
                    tmp = 0;
                } else {
                    tmp *= 10;
                    tmp += values[i + j] - '0';
                }
            }
            if (isPlus) {
                sum += tmp;
            } else {
                sum -= tmp;
            }
            ans = Math.max(ans, sum);
        }
        System.out.println(ans);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}