import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = sc.next().toCharArray();
        ArrayDeque<Integer> numStack = new ArrayDeque<>();
        ArrayDeque<Boolean> boolStack = new ArrayDeque<>();
        numStack.push(0);
        boolStack.push(true);
        int num = 0;
        int tmp = 0;
        boolean isPlus = true;
        for (char c : arr) {
            if (c == '+' || c == '-') {
                if (isPlus) {
                    num += tmp;
                } else {
                    num -= tmp;
                }
                tmp = 0;
                isPlus = (c == '+');
            } else if (c == '(') {
                if (isPlus) {
                    num += tmp;
                } else {
                    num -= tmp;
                }
                numStack.push(num);
                boolStack.push(isPlus);
                num = 0;
                tmp = 0;
                isPlus = true;
            } else if (c == ')') {
                if (isPlus) {
                    num += tmp;
                } else {
                    num -= tmp;
                }
                isPlus = boolStack.pop();
                if (isPlus) {
                    num = numStack.pop() + num;
                } else {
                    num = numStack.pop() - num;
                }
                tmp = 0;
                isPlus = true;
            } else {
                tmp *= 10;
                tmp += c - '0';
            }
        }
        if (isPlus) {
            num += tmp;
        } else {
            num -= tmp;
        }
        System.out.println(num);
    }
}