import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // readinput
        Scanner in = new Scanner(System.in);
        ArrayList<String> expr = new ArrayList<>();
        String[] input = in.nextLine().split("");
        int status = -1;
        String mask = new String();
        for (int i = 0; i < input.length; i++) {
            if (input[i].equals(" ")) {
                if (status == 1) {
                    expr.add(mask);
                    mask = new String();
                    status = 0;
                }
                continue;
            }
            if (input[i].equals(")") || input[i].equals("(") || input[i].equals("+") || input[i].equals("-") || input[i].equals("*")){
                if (status == 1) {
                    expr.add(mask);
                    mask = new String();
                    status = 0;
                }
                expr.add(input[i]);
                continue;
            }
            mask += input[i];
            status = 1;
        }
        if (!(mask.equals(""))) {
            expr.add(mask);

        }
        //input ready
        int operator = 0;
        BigInteger sum = BigInteger.valueOf(0);
        for (int i = expr.size()-1; i >= 0; i--) {
            if (expr.get(i).equals("+")) {
                operator = 1;
                continue;
            } else if (expr.get(i).equals("-")) {
                operator = 2;
                continue;
            } else if (expr.get(i).equals("*")) {
                operator = 3;
                continue;
            }
            if (expr.get(i).equals(")")) {
                continue;
            }
            if (expr.get(i).equals("(")) {
                continue;
            }
            BigInteger temp = new BigInteger(expr.get(i));
            if (sum.compareTo(BigInteger.valueOf(0)) == 0) {
                sum = sum.add(temp);
            }
            if (operator > 0){
                switch (operator){
                    case 1:
                        sum = sum.add(temp);
                        break;
                    case 2:
                        sum = temp.subtract(sum);
                        break;
                    case 3:
                        sum = sum.multiply(temp);
                        break;
                }
                operator = 0;
            }
        }
        System.out.println(sum);
    }
}