#include <iostream>
#include <algorithm>

int main(){
    std::string S;
    std::cin >> S;

    int L = S.size();
    int mx = -2002002002;
    for(int i=0;i<L;i++){
        if(!std::isdigit(S[i]) || !std::isdigit(S[(i+L-1)%L])){
            continue;
        }
        int j = 0, result = 0;
        while(j < L && std::isdigit(S[(i+j)%L])){
            result = result * 10 + S[(i+j)%L] - '0';
            j++;
        }
        
        for(;j<L;){
            int x = 0, sign = S[(i+j)%L]=='+' ? +1 : -1;

            j++;
            while(j < L && std::isdigit(S[(i+j)%L])){
                x = x * 10 + S[(i+j)%L] - '0';
                j++;
            }

            result += sign * x;
        }

        mx = std::max(mx, result);
    }

    std::cout << mx<< std::endl;
}