#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main() {
	string s; cin >> s;
	s += '=';

	int ans = -(1 << 30); //-1e15
	for (int j = 0; j<s.size() - 1; j++)
	{
		rotate(s.begin(), s.begin() + 1, s.end() - 1);
		if (!isdigit(s[0]) || !isdigit(s[s.size() - 2])) continue;

		int sum = 0, d = 0, p = 1;
		for (int i = 0; i<s.size(); i++){
			if (isdigit(s[i])){
				d *= 10;
				d += s[i] - '0';
			}
			else{
				sum += d*p;
				d = 0;
				if (s[i] == '-') p = -1;
				else p = 1;
			}
		}
		ans = max(ans, sum);
	}
	cout << ans << endl;
	return 0;
}