/*
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 * and open the template in the editor.
 */
package Bai7;

import java.util.*;

/**
 *
 * @author Vu Minh Duc
 */
public class vidu {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.nextLine();
        StackOfChars st = new StackOfChars(1000);
        try {
            for (int i = 0; i < s.length(); i++) {
                if (st.isEmpty() || s.charAt(i) != ')') {
                    st.push(s.charAt(i));
                } else {
                    while (!st.isEmpty() && st.peak() != '(') {
                        int tmp1 = st.pop() - '0';
                        char dau = st.pop();
                        int tmp2 = st.pop() - '0';
                        int res = 0;
                        switch (dau) {
                            case '+':
                                res = tmp1 + tmp2;
                                break;
                            case '-':
                                res = tmp2 - tmp1;
                                break;
                            case '*':
                                res = tmp1 * tmp2;
                                break;
                            case '/':
                                res = tmp2 / tmp1;
                                break;
                        }
                        st.push((char) res);
                    }
                }
            }
        } catch (ArrayIndexOutOfBoundsException e) {
            e.printStackTrace();
        }
        System.out.println(st.pop());
    }
}