let inpt = readLine()!

func calc(_ txt:String)-> Int {
    var ret = 0
    let plus = txt.split(separator: "+")

    for item in plus {
        var minus = item.split(separator: "-").map{ Int($0)!}
        ret = ret + minus.removeFirst()
        for item2 in minus {
            ret = ret - item2
        }
    }
    return ret
}


var ans:Int?
for i in  0..<inpt.count {
    let subText = String(inpt.suffix(inpt.count - i)) + String(inpt.prefix(i))
    if "+-".contains(subText.first!) || "+-".contains(subText.last!) {
        continue
    }
    let val = calc(subText)
    if let ansValue = ans {
        ans = max(ansValue, val)
    } else {
        ans = val
    }
}

print(ans!)