#include<bits/stdc++.h>
using lint=long long;
bool is_symbol(char c){return c=='+'||c=='-';}
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    std::string s;std::cin>>s;
    lint n=s.length();
    lint ans=0;
    for(lint i=0;i<n;i++){
        if(is_symbol(s.front())||is_symbol(s.back()))continue;
        lint now=0;
        for(lint j=0,x=0,neg=false;j<=n;j++){
            if(j==n||is_symbol(s.at(j))){
                now+=neg?-x:x;
                x=0;
                if(j<n)neg=s.at(j)=='-';
            }else{
                x=10*x+s.at(j)-'0';
            }
        }
        if(ans<now)ans=now;
        std::rotate(s.begin(),s.begin()+1,s.end());
    }
    std::cout<<ans<<'\n';
}