//
//  main.cpp
//  Q461
//
//  Created by AkihiroKOBAYASHI on 7/11/15.
//  Copyright (c) 2015 Akhr5884. All rights reserved.
//

#include <cstdlib>
#include <iostream>
#include <string>
#include <typeinfo>
#include <string.h>

char temp[20];
int head = 0;

void pushStack(char moji) {
    temp[head] = moji;
    head++;
}

int popStack() {
    std::string stack;
    stack = temp;
    memset( temp , NULL , sizeof(temp) );
    head = 0;
    std::cout << stoi(stack) << '\n';
    return std::stoi(stack);
}

int main(int argc, const char * argv[]) {
    
    char moji[40];
    char fugou = '+';
    std::string formula;
    int f_length, i, j, value, maxvalue;
    maxvalue = value = 0;
    
    std::cin >> formula;
    f_length = (int)formula.length();
    formula = formula + formula;
    sprintf(moji, "%s", formula.c_str());
    
    for(i = 0; i < f_length; i++) {
        value = 0;
        if(std::isdigit(static_cast<unsigned char>(moji[i])) && std::isdigit(static_cast<unsigned char>(moji[i+f_length-1]))) {
            for(j = i; j < i + f_length; j++) {
                if(moji[j] == '+' || moji[j] == '-'){
                    if(fugou == '+') {
                        value += popStack();
                    }
                    else if(fugou == '-') {
                        value -= popStack();
                    }
                    fugou = moji[j];
                }
                else {
                    pushStack(moji[j]);
                }
            }
            if(fugou == '+') {
                value += popStack();
            }
            else if(fugou == '-') {
                value -= popStack();
            }
            if(value > maxvalue) {
                maxvalue = value;
            }
        }
    }
    
    std::cout << maxvalue << '\n';
    
    return 0;
}