#include <map>
#include <set>
#include <list>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdio>
#include <string>
#include <vector>
#include <complex>
#include <cstdlib>
#include <cstring>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional>
 
#define mp       make_pair
#define pb       push_back
#define all(x)   (x).begin(),(x).end()
#define rep(i,n) for(int i=0;i<(n);i++)
 
using namespace std;
 
typedef    long long          ll;
typedef    unsigned long long ull;
typedef    vector<bool>       vb;
typedef    vector<int>        vi;
typedef    vector<vb>         vvb;
typedef    vector<vi>         vvi;
typedef    pair<int,int>      pii;
 
const int INF=1<<29;
const double EPS=1e-9;
 
const int dx[]={1,0,-1,0},dy[]={0,-1,0,1};

bool isenzansi(string &s, int pos) {
	return s[pos] == '+' || s[pos] == '-';
}

int ev(string &s) {
	if (isenzansi(s, 0) || isenzansi(s, s.size() - 1)) {
		return -1;
	}
	int p = 0;
	int now = 0;
	int ret = 0;
	char nextop = '+';
	while(p < s.size()) {
		if (!isenzansi(s, p)) {
			now *= 10;
			now += s[p] - '0';
		} else if (s[p] == '+') {
			if (nextop == '+') {
				ret += now;
			} else {
				ret -= now;
			}
			nextop = '+';
			now = 0;
		} else if (s[p] == '-') {
			if (nextop == '+') {
				ret += now;
			} else {
				ret -= now;
			}
			nextop = '-';
			now = 0;
		}
 		p++;
	}
	if (nextop == '+') {
		ret += now;
	} else {
		ret -= now;
	}
	return ret;
}

int main(int argc, char const *argv[]) {
	string s;
	cin >> s;
	s += s;
	int ans = -1;
	for (int i = 0; i < s.size() / 2; ++i) {
		string now = s.substr(i, s.size() / 2);
		int ret = ev(now);
		ans = max(ans, ret);
	}
	cout << ans << endl;

	return 0;
}