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

#define int long long
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

signed main()
{
  string s;
  cin >> s;

  int n = s.size();
  s += s;

  int ans = -inf;
  rep(i, n){
    if(s[i] == '+' or s[i] == '-' or s[n-1+i] == '+' or s[n-1+i] == '-') continue;

    int tmp = 0, t = 0, op = 0;
    rep(j, n){
      if('0' <= s[i+j] and s[i+j] <= '9'){
        t = 10*t + s[i+j]-'0';
      }else{
        if(op == 0){
          tmp += t;
        }else{
          tmp -= t;
        }
        t = 0;
        op = s[i+j] == '-';
      }
//      printf("%lld %lld %lld %lld %lld\n", i, j, tmp, t, op);
    }

    if(op == 0){
      tmp += t;
    }else{
      tmp -= t;
    }

    ans = max(ans, tmp);
  }

  cout << ans << endl;

  return 0;
}