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

int calc(int ee, char op, int er) {
    if(op == '-') return ee - er;
    return ee + er;
}

int getval(string s, int start, int len) {
    int result = 0;
    string er = ""s;
    char op = 'a';
    rep(i, len) {
        if(s[start+i] == '+') {
            if(op == 'a') result += stoi(er);
            else result = calc(result, op, stoi(er));
            er = ""s;
            op = '+';
        } else if(s[start+i] == '-') {
            if(op == 'a') result += stoi(er);
            else result = calc(result, op, stoi(er));
            er = ""s;
            op = '-';
        } else {
            er += s[start+i];
        }
    }
    result = calc(result, op, stoi(er));
    return result;
}

int main() {
    string s;
    cin >> s;
    int len = s.length();
    s += s;
    int result = -1e9;
    rep(i, len) {
        if(s[i] == '+' || s[i] == '-') continue;
        if(s[i+len-1] == '+' || s[i+len-1] == '-') continue;
        result = max(result, getval(s, i, len));
    }
    cout << result << "\n";
}