#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    
    string S;
    cin >> S;
    
    int siz = S.size();
    S += S;
    
    ll ans = LLONG_MIN;
    rep(i, 0, siz) {
        if (S[i] == '+' || S[i] == '-' || S[i + siz - 1] == '+' || S[i + siz - 1] == '-') continue;
        
        ll sign = 1;
        ll num = 0;
        ll res = 0;
        rep(j, i, i + siz) {
            if (S[j] == '+') {
                res += sign * num;
                sign = 1;
                num = 0;
            } else if (S[j] == '-') {
                res += sign * num;
                sign = -1;
                num = 0;
            } else {
                num *= 10;
                num += S[j] - '0';
            }
        }
        
        res += sign * num;
        
        ans = max(res, ans);
    }
    
    cout << ans << '\n';
}