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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);  
	
	string s;
	cin >> s;
	int n = s.length();
	s += s;
	int ans = -1e8;
	for(int i = 0; i < n; i++) {
		if(s[i] == '+' || s[i] == '-') continue;
		if(s[i + n - 1] == '+' || s[i + n - 1] == '-') continue;
		int tmp = 0;
		int num = 0;
		bool plus = true;
		for(int j = i; j < i + n; j++) {
			if(s[j] >= '0' && s[j] <= '9') {
				num *= 10;
				num += s[j] - '0';
			} else {
				if(plus) tmp += num;
				else tmp -= num;
				num = 0;
				if(s[j] == '+') plus = true;
				else plus = false;
			}
		}
		if(plus) tmp += num;
		else tmp -= num;
		ans = max(ans, tmp);
	}
	cout << ans << endl;
	return 0;	
}