#include<bits/stdc++.h>
using namespace std;
using ll = long long;

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

template < typename T >
void vprint(T &V){
	for(auto v : V){
    	cout << v << " ";
	}
	cout << endl;
}

// 構文解析
typedef string::const_iterator State;
class ParseError {};
int number(State &begin) {
    int ret = 0;

    while (isdigit(*begin)) {
        ret *= 10;
        ret += *begin - '0';
        begin++;
    }

    return ret;
}
int expression(State &begin) {
    int ret = number(begin);

    for (;;) {
        if (*begin == '+') {
            begin++;
            ret += number(begin);
        } else if (*begin == '-') {
            begin++;
            ret -= number(begin);
        } else {
            break;
        }
    }

    return ret;
}

ll eval(string s){
    if(!isdigit(s[0])) return -inf;
    if(!isdigit(s.back())) return -inf;
    
    State it = s.begin();
    return expression(it);
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    string s;
    cin >> s;
    ll L = s.size();

    s = s+s;

    ll ans = -inf;
    FOR(i, 0, s.size()-L+1){
        string sub = s.substr(i, L);
        ll v = eval(sub);
        ans = max(ans, v);
    }

    p(ans);
    
    return 0;
}