#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <time.h>
#include <random>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define LONG_INF 10000000000000000
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
int main() {
	string s;
	cin >> s;
	s += s;
	long long ans = -LONG_INF;
	for (int i = 0;i < s.length() / 2;++i) {
		if (s[i] != '-' && s[i] != '+'&&s[i-1 + (s.length() / 2)] != '-'&&s[i-1 + (s.length() / 2)] != '+') {
			long long wow = 0;
			long long pre_ans = 0;
			int plus = 1;
			for (int q = 0;q < s.length() / 2;++q) {
				if (s[i+q] >= '0' && s[i+q] <= '9') {
					wow *= 10;
					wow += s[i+q] - '0';
				}
				else {
					if (s[i + q - 1] == '-' || s[i + q-1] == '+') {
						goto ok;
					}
					if (plus == 1) {
						pre_ans += wow;
					}
					else pre_ans -= wow;
					if (s[i + q] == '+') {
						plus = 1;
					}
					else plus = 0;
					wow = 0;
				}
			}
			if (plus == 1) {
				pre_ans += wow;
			}
			else pre_ans -= wow;
			ans = max(ans, pre_ans);
		ok:;
		}
	}
	cout << ans << endl;
	return 0;
}