#!/usr/bin/env python
#coding:utf8

def read():
    return raw_input()


def calc(expr):
    ret = 0
    idx = 0
    
    expr = '+' + expr
    while idx < len(expr):
        isAdd = expr[idx] == '+'
        idx += 1

        num = ''
        while idx < len(expr) and expr[idx].isdigit():
             num += expr[idx]
             idx += 1

        if isAdd:
            ret += int(num)
        else:
            ret -= int(num)

    return ret

    
def work(s):
    ans = -(1 << 30)

    for L in range(len(s)):
        expr = s[L:] + s[:L]

        if expr[0]  == '+' or expr[0]  == '-' or \
           expr[-1] == '+' or expr[-1] == '-':
           continue
        
        ans = max(ans, calc(expr))

    print ans


if __name__ == "__main__":
    work(read())