#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  int ans = -1e9;
  rep(_, s.size()) {
    if (isdigit(s.front()) && isdigit(s.back())) {
      int now = 0, sum = 0;
      bool plus = true;
      for (char c : s) {
        if (isdigit(c)) {
          now = now * 10 + c - '0';
        }
        else {
          sum += plus ? now : -now;
          now = 0;
          assert(c == '+' || c == '-');
          plus = c == '+';
        }
      }
      sum += plus ? now : -now;
      ans = max(ans, sum);
    }
    s.push_back(s[0]);
    s.erase(s.begin());
  }
  cout << ans << endl;
  return 0;
}