#include<iostream>
#include<string>
using namespace std;
int main(){
    string S;
    int opi,len,buf,ans = -100000000;
    char op,c;
    cin >> S;
    len = S.length();
    for(int i=0;i<len;i++){
        c = S[len-1];
        S = c + S.substr(0,len-1);
        if(S[0] == '+' || S[0] == '-' || S[len-1] == '+' || S[len-1] == '-') continue;
        buf = 0;
        opi = -1;
        op = '+';
        for(int j=0;j<len;j++){
            if(j != len-1 && S[j] != '+' && S[j] != '-') continue;
            if(op == '+') buf += stoi(S.substr(opi+1,j-opi));
            else buf -= stoi(S.substr(opi+1,j-opi));
            op = S[j];
            opi = j;
        }
        if(ans < buf) ans = buf;
    }
    cout << ans << endl;
    return 0;
}