#include <bits/stdc++.h>
using namespace std;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))

typedef string::const_iterator st;
int num(st &s){
    int ret = 0;
    while(isdigit(*s)){ ret = ret * 10 + (*s - '0'); s++; }
    return ret;
}
int expr(st &s){
    int ret = num(s);
    while(1){
        if(*s == '+'){ s++; ret += num(s); } else
        if(*s == '-'){ s++; ret -= num(s); } else
        break;
    }
    return ret;
}
int calc(string s){ st ss=s.begin(); return expr(ss); }

int main(){
    string s;
    cin >> s;
    int res = 0, n = s.length();
    
    REP(i,n){
        if(isdigit(*s.begin()) && isdigit(*(s.end()-1))){
            res = max(res, calc(s));
        }
        s.push_back(s.front()); s.erase(s.begin());
    }
    cout << res << endl;
}