#include <bits/stdc++.h>
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define chmin(a, b) ((b) < a && (a = (b), true))
#define chmax(a, b) (a < (b) && (a = (b), true))
using namespace std;
typedef long long ll;

int parse_int(string s) {
	istringstream iss(s);
	int res;
	iss >> res;
	return res;
}

int parse(string s) {
	vector<string> nums;
	vector<char> op;
	string curr = "";
	rep (i, s.length()) {
		if (s[i] == '+' || s[i] == '-') {
			nums.push_back(curr);
			op.push_back(s[i]);
			curr = "";
		} else {
			curr += s[i];
		}
	}
	nums.push_back(curr);
	if (nums.size() != op.size() + 1) return -1;
	vector<int> v;
	rep (i, nums.size()) {
		if (nums[i] == "") return -1;
		v.push_back(parse_int(nums[i]));
	}
	int res = v[0];
	rep (i, v.size() - 1) {
		if (op[i] == '+') {
			res += v[i + 1];
		} else {
			res -= v[i + 1];
		}
	}
	return res;
}

int main() {
	string S;
	cin >> S;
	int ans = 0;
	rep (i, S.length()) {
		string head = S.substr(0, i);
		string tail = S.substr(i);		
		chmax(ans, parse(tail + head));
	}
	cout << ans << endl;
	return 0;
}